gecko/js/src/jsdate.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * JS date methods.
 */

#include "jsdate.h"

#include "mozilla/FloatingPoint.h"
#include "mozilla/Util.h"

/*
 * "For example, OS/360 devotes 26 bytes of the permanently
 *  resident date-turnover routine to the proper handling of
 *  December 31 on leap years (when it is Day 366).  That
 *  might have been left to the operator."
 *
 * Frederick Brooks, 'The Second-System Effect'.
 */

#include <ctype.h>
#include <locale.h>
#include <math.h>
#include <string.h>

#include "jstypes.h"
#include "jsprf.h"
#include "prmjtime.h"
#include "jsutil.h"
#include "jsapi.h"
#include "jsversion.h"
#include "jscntxt.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsstr.h"

#include "vm/DateTime.h"
#include "vm/GlobalObject.h"
#include "vm/NumericConversions.h"
#include "vm/String.h"
#include "vm/StringBuffer.h"

#include "jsobjinlines.h"

using namespace js;
using namespace js::types;

using mozilla::ArrayLength;

/*
 * The JS 'Date' object is patterned after the Java 'Date' object.
 * Here is a script:
 *
 *    today = new Date();
 *
 *    print(today.toLocaleString());
 *
 *    weekDay = today.getDay();
 *
 *
 * These Java (and ECMA-262) methods are supported:
 *
 *     UTC
 *     getDate (getUTCDate)
 *     getDay (getUTCDay)
 *     getHours (getUTCHours)
 *     getMinutes (getUTCMinutes)
 *     getMonth (getUTCMonth)
 *     getSeconds (getUTCSeconds)
 *     getMilliseconds (getUTCMilliseconds)
 *     getTime
 *     getTimezoneOffset
 *     getYear
 *     getFullYear (getUTCFullYear)
 *     parse
 *     setDate (setUTCDate)
 *     setHours (setUTCHours)
 *     setMinutes (setUTCMinutes)
 *     setMonth (setUTCMonth)
 *     setSeconds (setUTCSeconds)
 *     setMilliseconds (setUTCMilliseconds)
 *     setTime
 *     setYear (setFullYear, setUTCFullYear)
 *     toGMTString (toUTCString)
 *     toLocaleString
 *     toString
 *
 *
 * These Java methods are not supported
 *
 *     setDay
 *     before
 *     after
 *     equals
 *     hashCode
 */

inline double
Day(double t)
{
    return floor(t / msPerDay);
}

static double
TimeWithinDay(double t)
{
    double result = fmod(t, msPerDay);
    if (result < 0)
        result += msPerDay;
    return result;
}

/* ES5 15.9.1.3. */
inline bool
IsLeapYear(double year)
{
    JS_ASSERT(ToInteger(year) == year);
    return fmod(year, 4) == 0 && (fmod(year, 100) != 0 || fmod(year, 400) == 0);
}

inline double
DaysInYear(double year)
{
    if (!MOZ_DOUBLE_IS_FINITE(year))
        return js_NaN;
    return IsLeapYear(year) ? 366 : 365;
}

inline double
DayFromYear(double y)
{
    return 365 * (y - 1970) +
           floor((y - 1969) / 4.0) -
           floor((y - 1901) / 100.0) +
           floor((y - 1601) / 400.0);
}

inline double
TimeFromYear(double y)
{
    return DayFromYear(y) * msPerDay;
}

static double
YearFromTime(double t)
{
    if (!MOZ_DOUBLE_IS_FINITE(t))
        return js_NaN;

    JS_ASSERT(ToInteger(t) == t);

    double y = floor(t / (msPerDay * 365.2425)) + 1970;
    double t2 = TimeFromYear(y);

    /*
     * Adjust the year if the approximation was wrong.  Since the year was
     * computed using the average number of ms per year, it will usually
     * be wrong for dates within several hours of a year transition.
     */
    if (t2 > t) {
        y--;
    } else {
        if (t2 + msPerDay * DaysInYear(y) <= t)
            y++;
    }
    return y;
}

inline int
DaysInFebruary(double year)
{
    return IsLeapYear(year) ? 29 : 28;
}

/* ES5 15.9.1.4. */
inline double
DayWithinYear(double t, double year)
{
    JS_ASSERT_IF(MOZ_DOUBLE_IS_FINITE(t), YearFromTime(t) == year);
    return Day(t) - DayFromYear(year);
}

static double
MonthFromTime(double t)
{
    if (!MOZ_DOUBLE_IS_FINITE(t))
        return js_NaN;

    double year = YearFromTime(t);
    double d = DayWithinYear(t, year);

    int step;
    if (d < (step = 31))
        return 0;
    if (d < (step += DaysInFebruary(year)))
        return 1;
    if (d < (step += 31))
        return 2;
    if (d < (step += 30))
        return 3;
    if (d < (step += 31))
        return 4;
    if (d < (step += 30))
        return 5;
    if (d < (step += 31))
        return 6;
    if (d < (step += 31))
        return 7;
    if (d < (step += 30))
        return 8;
    if (d < (step += 31))
        return 9;
    if (d < (step += 30))
        return 10;
    return 11;
}

/* ES5 15.9.1.5. */
static double
DateFromTime(double t)
{
    if (!MOZ_DOUBLE_IS_FINITE(t))
        return js_NaN;

    double year = YearFromTime(t);
    double d = DayWithinYear(t, year);

    int next;
    if (d <= (next = 30))
        return d + 1;
    int step = next;
    if (d <= (next += DaysInFebruary(year)))
        return d - step;
    step = next;
    if (d <= (next += 31))
        return d - step;
    step = next;
    if (d <= (next += 30))
        return d - step;
    step = next;
    if (d <= (next += 31))
        return d - step;
    step = next;
    if (d <= (next += 30))
        return d - step;
    step = next;
    if (d <= (next += 31))
        return d - step;
    step = next;
    if (d <= (next += 31))
        return d - step;
    step = next;
    if (d <= (next += 30))
        return d - step;
    step = next;
    if (d <= (next += 31))
        return d - step;
    step = next;
    if (d <= (next += 30))
        return d - step;
    step = next;
    return d - step;
}

/* ES5 15.9.1.6. */
static int
WeekDay(double t)
{
    /*
     * We can't assert TimeClip(t) == t because we call this function with
     * local times, which can be offset outside TimeClip's permitted range.
     */
    JS_ASSERT(ToInteger(t) == t);
    int result = (int(Day(t)) + 4) % 7;
    if (result < 0)
        result += 7;
    return result;
}

inline int
DayFromMonth(int month, bool isLeapYear)
{
    /*
     * The following array contains the day of year for the first day of
     * each month, where index 0 is January, and day 0 is January 1.
     */
    static const int firstDayOfMonth[2][13] = {
        {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
        {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
    };

    JS_ASSERT(0 <= month && month <= 12);
    return firstDayOfMonth[isLeapYear][month];
}

template<typename T>
inline int
DayFromMonth(T month, bool isLeapYear) MOZ_DELETE;

/* ES5 15.9.1.12 (out of order to accommodate DaylightSavingTA). */
static double
MakeDay(double year, double month, double date)
{
    /* Step 1. */
    if (!MOZ_DOUBLE_IS_FINITE(year) || !MOZ_DOUBLE_IS_FINITE(month) || !MOZ_DOUBLE_IS_FINITE(date))
        return js_NaN;

    /* Steps 2-4. */
    double y = ToInteger(year);
    double m = ToInteger(month);
    double dt = ToInteger(date);

    /* Step 5. */
    double ym = y + floor(m / 12);

    /* Step 6. */
    int mn = int(fmod(m, 12.0));
    if (mn < 0)
        mn += 12;

    /* Steps 7-8. */
    bool leap = IsLeapYear(ym);

    double yearday = floor(TimeFromYear(ym) / msPerDay);
    double monthday = DayFromMonth(mn, leap);

    return yearday + monthday + dt - 1;
}

/* ES5 15.9.1.13 (out of order to accommodate DaylightSavingTA). */
inline double
MakeDate(double day, double time)
{
    /* Step 1. */
    if (!MOZ_DOUBLE_IS_FINITE(day) || !MOZ_DOUBLE_IS_FINITE(time))
        return js_NaN;

    /* Step 2. */
    return day * msPerDay + time;
}

/*
 * Find a year for which any given date will fall on the same weekday.
 *
 * This function should be used with caution when used other than
 * for determining DST; it hasn't been proven not to produce an
 * incorrect year for times near year boundaries.
 */
static int
EquivalentYearForDST(int year)
{
    /*
     * Years and leap years on which Jan 1 is a Sunday, Monday, etc.
     *
     * yearStartingWith[0][i] is an example non-leap year where
     * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
     *
     * yearStartingWith[1][i] is an example leap year where
     * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
     */
    static const int yearStartingWith[2][7] = {
        {1978, 1973, 1974, 1975, 1981, 1971, 1977},
        {1984, 1996, 1980, 1992, 1976, 1988, 1972}
    };

    int day = int(DayFromYear(year) + 4) % 7;
    if (day < 0)
        day += 7;

    return yearStartingWith[IsLeapYear(year)][day];
}

/* ES5 15.9.1.8. */
static double
DaylightSavingTA(double t, DateTimeInfo *dtInfo)
{
    if (!MOZ_DOUBLE_IS_FINITE(t))
        return js_NaN;

    /*
     * If earlier than 1970 or after 2038, potentially beyond the ken of
     * many OSes, map it to an equivalent year before asking.
     */
    if (t < 0.0 || t > 2145916800000.0) {
        int year = EquivalentYearForDST(int(YearFromTime(t)));
        double day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
        t = MakeDate(day, TimeWithinDay(t));
    }

    int64_t utcMilliseconds = static_cast<int64_t>(t);
    int64_t offsetMilliseconds = dtInfo->getDSTOffsetMilliseconds(utcMilliseconds);
    return static_cast<double>(offsetMilliseconds);
}

static double
AdjustTime(double date, DateTimeInfo *dtInfo)
{
    double t = DaylightSavingTA(date, dtInfo) + dtInfo->localTZA();
    t = (dtInfo->localTZA() >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay);
    return t;
}

/* ES5 15.9.1.9. */
static double
LocalTime(double t, DateTimeInfo *dtInfo)
{
    return t + AdjustTime(t, dtInfo);
}

static double
UTC(double t, DateTimeInfo *dtInfo)
{
    return t - AdjustTime(t - dtInfo->localTZA(), dtInfo);
}

/* ES5 15.9.1.10. */
static double
HourFromTime(double t)
{
    double result = fmod(floor(t/msPerHour), HoursPerDay);
    if (result < 0)
        result += HoursPerDay;
    return result;
}

static double
MinFromTime(double t)
{
    double result = fmod(floor(t / msPerMinute), MinutesPerHour);
    if (result < 0)
        result += MinutesPerHour;
    return result;
}

static double
SecFromTime(double t)
{
    double result = fmod(floor(t / msPerSecond), SecondsPerMinute);
    if (result < 0)
        result += SecondsPerMinute;
    return result;
}

static double
msFromTime(double t)
{
    double result = fmod(t, msPerSecond);
    if (result < 0)
        result += msPerSecond;
    return result;
}

/* ES5 15.9.1.11. */
static double
MakeTime(double hour, double min, double sec, double ms)
{
    /* Step 1. */
    if (!MOZ_DOUBLE_IS_FINITE(hour) ||
        !MOZ_DOUBLE_IS_FINITE(min) ||
        !MOZ_DOUBLE_IS_FINITE(sec) ||
        !MOZ_DOUBLE_IS_FINITE(ms))
    {
        return js_NaN;
    }

    /* Step 2. */
    double h = ToInteger(hour);

    /* Step 3. */
    double m = ToInteger(min);

    /* Step 4. */
    double s = ToInteger(sec);

    /* Step 5. */
    double milli = ToInteger(ms);

    /* Steps 6-7. */
    return h * msPerHour + m * msPerMinute + s * msPerSecond + milli;
}

/**
 * end of ECMA 'support' functions
 */

static JSBool
date_convert(JSContext *cx, HandleObject obj, JSType hint, MutableHandleValue vp)
{
    JS_ASSERT(hint == JSTYPE_NUMBER || hint == JSTYPE_STRING || hint == JSTYPE_VOID);
    JS_ASSERT(obj->isDate());

    return DefaultValue(cx, obj, (hint == JSTYPE_VOID) ? JSTYPE_STRING : hint, vp);
}

/*
 * Other Support routines and definitions
 */

Class js::DateClass = {
    js_Date_str,
    JSCLASS_HAS_RESERVED_SLOTS(JSObject::DATE_CLASS_RESERVED_SLOTS) |
    JSCLASS_HAS_CACHED_PROTO(JSProto_Date),
    JS_PropertyStub,         /* addProperty */
    JS_DeletePropertyStub,   /* delProperty */
    JS_PropertyStub,         /* getProperty */
    JS_StrictPropertyStub,   /* setProperty */
    JS_EnumerateStub,
    JS_ResolveStub,
    date_convert
};

/* for use by date_parse */

static const char* wtb[] = {
    "am", "pm",
    "monday", "tuesday", "wednesday", "thursday", "friday",
    "saturday", "sunday",
    "january", "february", "march", "april", "may", "june",
    "july", "august", "september", "october", "november", "december",
    "gmt", "ut", "utc",
    "est", "edt",
    "cst", "cdt",
    "mst", "mdt",
    "pst", "pdt"
    /* time zone table needs to be expanded */
};

static int ttb[] = {
    -1, -2, 0, 0, 0, 0, 0, 0, 0,       /* AM/PM */
    2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
    10000 + 0, 10000 + 0, 10000 + 0,   /* GMT/UT/UTC */
    10000 + 5 * 60, 10000 + 4 * 60,    /* EST/EDT */
    10000 + 6 * 60, 10000 + 5 * 60,    /* CST/CDT */
    10000 + 7 * 60, 10000 + 6 * 60,    /* MST/MDT */
    10000 + 8 * 60, 10000 + 7 * 60     /* PST/PDT */
};

/* helper for date_parse */
static JSBool
date_regionMatches(const char* s1, int s1off, const jschar* s2, int s2off,
                   int count, int ignoreCase)
{
    JSBool result = JS_FALSE;
    /* return true if matches, otherwise, false */

    while (count > 0 && s1[s1off] && s2[s2off]) {
        if (ignoreCase) {
            if (unicode::ToLowerCase(s1[s1off]) != unicode::ToLowerCase(s2[s2off]))
                break;
        } else {
            if ((jschar)s1[s1off] != s2[s2off]) {
                break;
            }
        }
        s1off++;
        s2off++;
        count--;
    }

    if (count == 0) {
        result = JS_TRUE;
    }

    return result;
}

/* find UTC time from given date... no 1900 correction! */
static double
date_msecFromDate(double year, double mon, double mday, double hour,
                  double min, double sec, double msec)
{
    return MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, msec));
}

/* compute the time in msec (unclipped) from the given args */
#define MAXARGS        7

static JSBool
date_msecFromArgs(JSContext *cx, CallArgs args, double *rval)
{
    unsigned loop;
    double array[MAXARGS];
    double msec_time;

    for (loop = 0; loop < MAXARGS; loop++) {
        if (loop < args.length()) {
            double d;
            if (!ToNumber(cx, args[loop], &d))
                return JS_FALSE;
            /* return NaN if any arg is not finite */
            if (!MOZ_DOUBLE_IS_FINITE(d)) {
                *rval = js_NaN;
                return JS_TRUE;
            }
            array[loop] = ToInteger(d);
        } else {
            if (loop == 2) {
                array[loop] = 1; /* Default the date argument to 1. */
            } else {
                array[loop] = 0;
            }
        }
    }

    /* adjust 2-digit years into the 20th century */
    if (array[0] >= 0 && array[0] <= 99)
        array[0] += 1900;

    msec_time = date_msecFromDate(array[0], array[1], array[2],
                                  array[3], array[4], array[5], array[6]);
    *rval = msec_time;
    return JS_TRUE;
}

/*
 * See ECMA 15.9.4.[3-10];
 */
static JSBool
date_UTC(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    double msec_time;
    if (!date_msecFromArgs(cx, args, &msec_time))
        return JS_FALSE;

    msec_time = TimeClip(msec_time);

    args.rval().setNumber(msec_time);
    return JS_TRUE;
}

/*
 * Read and convert decimal digits from s[*i] into *result
 * while *i < limit.
 *
 * Succeed if any digits are converted. Advance *i only
 * as digits are consumed.
 */
static JSBool
digits(size_t *result, const jschar *s, size_t *i, size_t limit)
{
    size_t init = *i;
    *result = 0;
    while (*i < limit &&
           ('0' <= s[*i] && s[*i] <= '9')) {
        *result *= 10;
        *result += (s[*i] - '0');
        ++(*i);
    }
    return (*i != init);
}

/*
 * Read and convert decimal digits to the right of a decimal point,
 * representing a fractional integer, from s[*i] into *result
 * while *i < limit.
 *
 * Succeed if any digits are converted. Advance *i only
 * as digits are consumed.
 */
static JSBool
fractional(double *result, const jschar *s, size_t *i, size_t limit)
{
    double factor = 0.1;
    size_t init = *i;
    *result = 0.0;
    while (*i < limit &&
           ('0' <= s[*i] && s[*i] <= '9')) {
        *result += (s[*i] - '0') * factor;
        factor *= 0.1;
        ++(*i);
    }
    return (*i != init);
}

/*
 * Read and convert exactly n decimal digits from s[*i]
 * to s[min(*i+n,limit)] into *result.
 *
 * Succeed if exactly n digits are converted. Advance *i only
 * on success.
 */
static JSBool
ndigits(size_t n, size_t *result, const jschar *s, size_t* i, size_t limit)
{
    size_t init = *i;

    if (digits(result, s, i, Min(limit, init+n)))
        return ((*i - init) == n);

    *i = init;
    return JS_FALSE;
}

static int
DaysInMonth(int year, int month)
{
    bool leap = IsLeapYear(year);
    int result = int(DayFromMonth(month, leap) - DayFromMonth(month - 1, leap));
    return result;
}

/*
 * Parse a string in one of the date-time formats given by the W3C
 * "NOTE-datetime" specification. These formats make up a restricted
 * profile of the ISO 8601 format. Quoted here:
 *
 *   The formats are as follows. Exactly the components shown here
 *   must be present, with exactly this punctuation. Note that the "T"
 *   appears literally in the string, to indicate the beginning of the
 *   time element, as specified in ISO 8601.
 *
 *   Any combination of the date formats with the time formats is
 *   allowed, and also either the date or the time can be missing.
 *
 *   The specification is silent on the meaning when fields are
 *   ommitted so the interpretations are a guess, but hopefully a
 *   reasonable one. We default the month to January, the day to the
 *   1st, and hours minutes and seconds all to 0. If the date is
 *   missing entirely then we assume 1970-01-01 so that the time can
 *   be aded to a date later. If the time is missing then we assume
 *   00:00 UTC.  If the time is present but the time zone field is
 *   missing then we use local time.
 *
 * Date part:
 *
 *  Year:
 *     YYYY (eg 1997)
 *
 *  Year and month:
 *     YYYY-MM (eg 1997-07)
 *
 *  Complete date:
 *     YYYY-MM-DD (eg 1997-07-16)
 *
 * Time part:
 *
 *  Hours and minutes:
 *     Thh:mmTZD (eg T19:20+01:00)
 *
 *  Hours, minutes and seconds:
 *     Thh:mm:ssTZD (eg T19:20:30+01:00)
 *
 *  Hours, minutes, seconds and a decimal fraction of a second:
 *     Thh:mm:ss.sTZD (eg T19:20:30.45+01:00)
 *
 * where:
 *
 *   YYYY = four-digit year or six digit year as +YYYYYY or -YYYYYY
 *   MM   = two-digit month (01=January, etc.)
 *   DD   = two-digit day of month (01 through 31)
 *   hh   = two digits of hour (00 through 23) (am/pm NOT allowed)
 *   mm   = two digits of minute (00 through 59)
 *   ss   = two digits of second (00 through 59)
 *   s    = one or more digits representing a decimal fraction of a second
 *   TZD  = time zone designator (Z or +hh:mm or -hh:mm or missing for local)
 */

static JSBool
date_parseISOString(JSLinearString *str, double *result, DateTimeInfo *dtInfo)
{
    double msec;

    const jschar *s;
    size_t limit;
    size_t i = 0;
    int tzMul = 1;
    int dateMul = 1;
    size_t year = 1970;
    size_t month = 1;
    size_t day = 1;
    size_t hour = 0;
    size_t min = 0;
    size_t sec = 0;
    double frac = 0;
    bool isLocalTime = JS_FALSE;
    size_t tzHour = 0;
    size_t tzMin = 0;

#define PEEK(ch) (i < limit && s[i] == ch)

#define NEED(ch)                                                     \
    JS_BEGIN_MACRO                                                   \
        if (i >= limit || s[i] != ch) { goto syntax; } else { ++i; } \
    JS_END_MACRO

#define DONE_DATE_UNLESS(ch)                                            \
    JS_BEGIN_MACRO                                                      \
        if (i >= limit || s[i] != ch) { goto done_date; } else { ++i; } \
    JS_END_MACRO

#define DONE_UNLESS(ch)                                            \
    JS_BEGIN_MACRO                                                 \
        if (i >= limit || s[i] != ch) { goto done; } else { ++i; } \
    JS_END_MACRO

#define NEED_NDIGITS(n, field)                                      \
    JS_BEGIN_MACRO                                                  \
        if (!ndigits(n, &field, s, &i, limit)) { goto syntax; }     \
    JS_END_MACRO

    s = str->chars();
    limit = str->length();

    if (PEEK('+') || PEEK('-')) {
        if (PEEK('-'))
            dateMul = -1;
        ++i;
        NEED_NDIGITS(6, year);
    } else if (!PEEK('T')) {
        NEED_NDIGITS(4, year);
    }
    DONE_DATE_UNLESS('-');
    NEED_NDIGITS(2, month);
    DONE_DATE_UNLESS('-');
    NEED_NDIGITS(2, day);

 done_date:
    DONE_UNLESS('T');
    NEED_NDIGITS(2, hour);
    NEED(':');
    NEED_NDIGITS(2, min);

    if (PEEK(':')) {
        ++i;
        NEED_NDIGITS(2, sec);
        if (PEEK('.')) {
            ++i;
            if (!fractional(&frac, s, &i, limit))
                goto syntax;
        }
    }

    if (PEEK('Z')) {
        ++i;
    } else if (PEEK('+') || PEEK('-')) {
        if (PEEK('-'))
            tzMul = -1;
        ++i;
        NEED_NDIGITS(2, tzHour);
        /*
         * Non-standard extension to the ISO date format (permitted by ES5):
         * allow "-0700" as a time zone offset, not just "-07:00".
         */
        if (PEEK(':'))
          ++i;
        NEED_NDIGITS(2, tzMin);
    } else {
        isLocalTime = JS_TRUE;
    }

 done:
    if (year > 275943 // ceil(1e8/365) + 1970
        || (month == 0 || month > 12)
        || (day == 0 || day > size_t(DaysInMonth(year,month)))
        || hour > 24
        || ((hour == 24) && (min > 0 || sec > 0))
        || min > 59
        || sec > 59
        || tzHour > 23
        || tzMin > 59)
        goto syntax;

    if (i != limit)
        goto syntax;

    month -= 1; /* convert month to 0-based */

    msec = date_msecFromDate(dateMul * (double)year, month, day,
                             hour, min, sec,
                             frac * 1000.0);;

    if (isLocalTime) {
        msec = UTC(msec, dtInfo);
    } else {
        msec -= ((tzMul) * ((tzHour * msPerHour)
                            + (tzMin * msPerMinute)));
    }

    if (msec < -8.64e15 || msec > 8.64e15)
        goto syntax;

    *result = msec;

    return JS_TRUE;

 syntax:
    /* syntax error */
    *result = 0;
    return JS_FALSE;

#undef PEEK
#undef NEED
#undef DONE_UNLESS
#undef NEED_NDIGITS
}

static JSBool
date_parseString(JSLinearString *str, double *result, DateTimeInfo *dtInfo)
{
    double msec;

    const jschar *s;
    size_t limit;
    size_t i = 0;
    int year = -1;
    int mon = -1;
    int mday = -1;
    int hour = -1;
    int min = -1;
    int sec = -1;
    int c = -1;
    int n = -1;
    int tzoffset = -1;
    int prevc = 0;
    JSBool seenplusminus = JS_FALSE;
    int temp;
    JSBool seenmonthname = JS_FALSE;

    if (date_parseISOString(str, result, dtInfo))
        return JS_TRUE;

    s = str->chars();
    limit = str->length();
    if (limit == 0)
        goto syntax;
    while (i < limit) {
        c = s[i];
        i++;
        if (c <= ' ' || c == ',' || c == '-') {
            if (c == '-' && '0' <= s[i] && s[i] <= '9') {
              prevc = c;
            }
            continue;
        }
        if (c == '(') { /* comments) */
            int depth = 1;
            while (i < limit) {
                c = s[i];
                i++;
                if (c == '(') depth++;
                else if (c == ')')
                    if (--depth <= 0)
                        break;
            }
            continue;
        }
        if ('0' <= c && c <= '9') {
            n = c - '0';
            while (i < limit && '0' <= (c = s[i]) && c <= '9') {
                n = n * 10 + c - '0';
                i++;
            }

            /* allow TZA before the year, so
             * 'Wed Nov 05 21:49:11 GMT-0800 1997'
             * works */

            /* uses of seenplusminus allow : in TZA, so Java
             * no-timezone style of GMT+4:30 works
             */

            if ((prevc == '+' || prevc == '-')/*  && year>=0 */) {
                /* make ':' case below change tzoffset */
                seenplusminus = JS_TRUE;

                /* offset */
                if (n < 24)
                    n = n * 60; /* EG. "GMT-3" */
                else
                    n = n % 100 + n / 100 * 60; /* eg "GMT-0430" */
                if (prevc == '+')       /* plus means east of GMT */
                    n = -n;
                if (tzoffset != 0 && tzoffset != -1)
                    goto syntax;
                tzoffset = n;
            } else if (prevc == '/' && mon >= 0 && mday >= 0 && year < 0) {
                if (c <= ' ' || c == ',' || c == '/' || i >= limit)
                    year = n;
                else
                    goto syntax;
            } else if (c == ':') {
                if (hour < 0)
                    hour = /*byte*/ n;
                else if (min < 0)
                    min = /*byte*/ n;
                else
                    goto syntax;
            } else if (c == '/') {
                /* until it is determined that mon is the actual
                   month, keep it as 1-based rather than 0-based */
                if (mon < 0)
                    mon = /*byte*/ n;
                else if (mday < 0)
                    mday = /*byte*/ n;
                else
                    goto syntax;
            } else if (i < limit && c != ',' && c > ' ' && c != '-' && c != '(') {
                goto syntax;
            } else if (seenplusminus && n < 60) {  /* handle GMT-3:30 */
                if (tzoffset < 0)
                    tzoffset -= n;
                else
                    tzoffset += n;
            } else if (hour >= 0 && min < 0) {
                min = /*byte*/ n;
            } else if (prevc == ':' && min >= 0 && sec < 0) {
                sec = /*byte*/ n;
            } else if (mon < 0) {
                mon = /*byte*/n;
            } else if (mon >= 0 && mday < 0) {
                mday = /*byte*/ n;
            } else if (mon >= 0 && mday >= 0 && year < 0) {
                year = n;
            } else {
                goto syntax;
            }
            prevc = 0;
        } else if (c == '/' || c == ':' || c == '+' || c == '-') {
            prevc = c;
        } else {
            size_t st = i - 1;
            int k;
            while (i < limit) {
                c = s[i];
                if (!(('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')))
                    break;
                i++;
            }
            if (i <= st + 1)
                goto syntax;
            for (k = ArrayLength(wtb); --k >= 0;)
                if (date_regionMatches(wtb[k], 0, s, st, i-st, 1)) {
                    int action = ttb[k];
                    if (action != 0) {
                        if (action < 0) {
                            /*
                             * AM/PM. Count 12:30 AM as 00:30, 12:30 PM as
                             * 12:30, instead of blindly adding 12 if PM.
                             */
                            JS_ASSERT(action == -1 || action == -2);
                            if (hour > 12 || hour < 0) {
                                goto syntax;
                            } else {
                                if (action == -1 && hour == 12) { /* am */
                                    hour = 0;
                                } else if (action == -2 && hour != 12) { /* pm */
                                    hour += 12;
                                }
                            }
                        } else if (action <= 13) { /* month! */
                            /* Adjust mon to be 1-based until the final values
                               for mon, mday and year are adjusted below */
                            if (seenmonthname) {
                                goto syntax;
                            }
                            seenmonthname = JS_TRUE;
                            temp = /*byte*/ (action - 2) + 1;

                            if (mon < 0) {
                                mon = temp;
                            } else if (mday < 0) {
                                mday = mon;
                                mon = temp;
                            } else if (year < 0) {
                                year = mon;
                                mon = temp;
                            } else {
                                goto syntax;
                            }
                        } else {
                            tzoffset = action - 10000;
                        }
                    }
                    break;
                }
            if (k < 0)
                goto syntax;
            prevc = 0;
        }
    }
    if (year < 0 || mon < 0 || mday < 0)
        goto syntax;
    /*
      Case 1. The input string contains an English month name.
              The form of the string can be month f l, or f month l, or
              f l month which each evaluate to the same date.
              If f and l are both greater than or equal to 70, or
              both less than 70, the date is invalid.
              The year is taken to be the greater of the values f, l.
              If the year is greater than or equal to 70 and less than 100,
              it is considered to be the number of years after 1900.
      Case 2. The input string is of the form "f/m/l" where f, m and l are
              integers, e.g. 7/16/45.
              Adjust the mon, mday and year values to achieve 100% MSIE
              compatibility.
              a. If 0 <= f < 70, f/m/l is interpreted as month/day/year.
                 i.  If year < 100, it is the number of years after 1900
                 ii. If year >= 100, it is the number of years after 0.
              b. If 70 <= f < 100
                 i.  If m < 70, f/m/l is interpreted as
                     year/month/day where year is the number of years after
                     1900.
                 ii. If m >= 70, the date is invalid.
              c. If f >= 100
                 i.  If m < 70, f/m/l is interpreted as
                     year/month/day where year is the number of years after 0.
                 ii. If m >= 70, the date is invalid.
    */
    if (seenmonthname) {
        if ((mday >= 70 && year >= 70) || (mday < 70 && year < 70)) {
            goto syntax;
        }
        if (mday > year) {
            temp = year;
            year = mday;
            mday = temp;
        }
        if (year >= 70 && year < 100) {
            year += 1900;
        }
    } else if (mon < 70) { /* (a) month/day/year */
        if (year < 100) {
            year += 1900;
        }
    } else if (mon < 100) { /* (b) year/month/day */
        if (mday < 70) {
            temp = year;
            year = mon + 1900;
            mon = mday;
            mday = temp;
        } else {
            goto syntax;
        }
    } else { /* (c) year/month/day */
        if (mday < 70) {
            temp = year;
            year = mon;
            mon = mday;
            mday = temp;
        } else {
            goto syntax;
        }
    }
    mon -= 1; /* convert month to 0-based */
    if (sec < 0)
        sec = 0;
    if (min < 0)
        min = 0;
    if (hour < 0)
        hour = 0;

    msec = date_msecFromDate(year, mon, mday, hour, min, sec, 0);

    if (tzoffset == -1) { /* no time zone specified, have to use local */
        msec = UTC(msec, dtInfo);
    } else {
        msec += tzoffset * msPerMinute;
    }

    *result = msec;
    return JS_TRUE;

syntax:
    /* syntax error */
    *result = 0;
    return JS_FALSE;
}

static JSBool
date_parse(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    if (args.length() == 0) {
        vp->setDouble(js_NaN);
        return true;
    }

    JSString *str = ToString<CanGC>(cx, args[0]);
    if (!str)
        return false;

    JSLinearString *linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return false;

    double result;
    if (!date_parseString(linearStr, &result, &cx->runtime->dateTimeInfo)) {
        vp->setDouble(js_NaN);
        return true;
    }

    result = TimeClip(result);
    vp->setNumber(result);
    return true;
}

static inline double
NowAsMillis()
{
    return (double) (PRMJ_Now() / PRMJ_USEC_PER_MSEC);
}

static JSBool
date_now(JSContext *cx, unsigned argc, Value *vp)
{
    vp->setDouble(NowAsMillis());
    return JS_TRUE;
}

/*
 * Set UTC time to a given time and invalidate cached local time.
 */
static void
SetUTCTime(JSObject *obj, double t, Value *vp = NULL)
{
    JS_ASSERT(obj->isDate());

    for (size_t ind = JSObject::JSSLOT_DATE_COMPONENTS_START;
         ind < JSObject::DATE_CLASS_RESERVED_SLOTS;
         ind++) {
        obj->setSlot(ind, UndefinedValue());
    }

    obj->setDateUTCTime(DoubleValue(t));
    if (vp)
        vp->setDouble(t);
}

/*
 * Cache the local time, year, month, and so forth of the object.
 * If UTC time is not finite (e.g., NaN), the local time
 * slots will be set to the UTC time without conversion.
 */
static void
FillLocalTimeSlots(DateTimeInfo *dtInfo, JSObject *obj)
{
    JS_ASSERT(obj->isDate());

    /* Check if the cache is already populated. */
    if (!obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_TIME).isUndefined() &&
        obj->getSlot(JSObject::JSSLOT_DATE_TZA).toDouble() == dtInfo->localTZA())
    {
        return;
    }

    /* Remember timezone used to generate the local cache. */
    obj->setSlot(JSObject::JSSLOT_DATE_TZA, DoubleValue(dtInfo->localTZA()));

    double utcTime = obj->getDateUTCTime().toNumber();

    if (!MOZ_DOUBLE_IS_FINITE(utcTime)) {
        for (size_t ind = JSObject::JSSLOT_DATE_COMPONENTS_START;
             ind < JSObject::DATE_CLASS_RESERVED_SLOTS;
             ind++) {
            obj->setSlot(ind, DoubleValue(utcTime));
        }
        return;
    }

    double localTime = LocalTime(utcTime, dtInfo);

    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_TIME, DoubleValue(localTime));

    int year = (int) floor(localTime /(msPerDay * 365.2425)) + 1970;
    double yearStartTime = TimeFromYear(year);

    /* Adjust the year in case the approximation was wrong, as in YearFromTime. */
    int yearDays;
    if (yearStartTime > localTime) {
        year--;
        yearStartTime -= (msPerDay * DaysInYear(year));
        yearDays = DaysInYear(year);
    } else {
        yearDays = DaysInYear(year);
        double nextStart = yearStartTime + (msPerDay * yearDays);
        if (nextStart <= localTime) {
            year++;
            yearStartTime = nextStart;
            yearDays = DaysInYear(year);
        }
    }

    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_YEAR, Int32Value(year));

    uint64_t yearTime = uint64_t(localTime - yearStartTime);
    int yearSeconds = uint32_t(yearTime / 1000);

    int day = yearSeconds / int(SecondsPerDay);

    int step = -1, next = 30;
    int month;

    do {
        if (day <= next) {
            month = 0;
            break;
        }
        step = next;
        next += ((yearDays == 366) ? 29 : 28);
        if (day <= next) {
            month = 1;
            break;
        }
        step = next;
        if (day <= (next += 31)) {
            month = 2;
            break;
        }
        step = next;
        if (day <= (next += 30)) {
            month = 3;
            break;
        }
        step = next;
        if (day <= (next += 31)) {
            month = 4;
            break;
        }
        step = next;
        if (day <= (next += 30)) {
            month = 5;
            break;
        }
        step = next;
        if (day <= (next += 31)) {
            month = 6;
            break;
        }
        step = next;
        if (day <= (next += 31)) {
            month = 7;
            break;
        }
        step = next;
        if (day <= (next += 30)) {
            month = 8;
            break;
        }
        step = next;
        if (day <= (next += 31)) {
            month = 9;
            break;
        }
        step = next;
        if (day <= (next += 30)) {
            month = 10;
            break;
        }
        step = next;
        month = 11;
    } while (0);

    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_MONTH, Int32Value(month));
    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_DATE, Int32Value(day - step));

    int weekday = WeekDay(localTime);
    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_DAY, Int32Value(weekday));

    int seconds = yearSeconds % 60;
    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_SECONDS, Int32Value(seconds));

    int minutes = (yearSeconds / 60) % 60;
    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_MINUTES, Int32Value(minutes));

    int hours = (yearSeconds / (60 * 60)) % 24;
    obj->setSlot(JSObject::JSSLOT_DATE_LOCAL_HOURS, Int32Value(hours));
}

inline double
GetCachedLocalTime(DateTimeInfo *dtInfo, JSObject *obj)
{
    JS_ASSERT(obj);
    FillLocalTimeSlots(dtInfo, obj);
    return obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_TIME).toDouble();
}

JS_ALWAYS_INLINE bool
IsDate(const Value &v)
{
    return v.isObject() && v.toObject().hasClass(&DateClass);
}

/*
 * See ECMA 15.9.5.4 thru 15.9.5.23
 */
JS_ALWAYS_INLINE bool
date_getTime_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));
    args.rval().set(args.thisv().toObject().getDateUTCTime());
    return true;
}

static JSBool
date_getTime(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getTime_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    Value yearVal = thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_YEAR);
    if (yearVal.isInt32()) {
        /* Follow ECMA-262 to the letter, contrary to IE JScript. */
        int year = yearVal.toInt32() - 1900;
        args.rval().setInt32(year);
    } else {
        args.rval().set(yearVal);
    }

    return true;
}

static JSBool
date_getYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getYear_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getFullYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_YEAR));
    return true;
}

static JSBool
date_getFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getFullYear_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCFullYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = YearFromTime(result);

    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getUTCFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCFullYear_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getMonth_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_MONTH));
    return true;
}

static JSBool
date_getMonth(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getMonth_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCMonth_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double d = args.thisv().toObject().getDateUTCTime().toNumber();
    args.rval().setNumber(MonthFromTime(d));
    return true;
}

static JSBool
date_getUTCMonth(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCMonth_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getDate_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_DATE));
    return true;
}

static JSBool
date_getDate(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getDate_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCDate_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = DateFromTime(result);

    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getUTCDate(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCDate_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getDay_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_DAY));
    return true;
}

static JSBool
date_getDay(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getDay_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCDay_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = WeekDay(result);

    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getUTCDay(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCDay_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getHours_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_HOURS));
    return true;
}

static JSBool
date_getHours(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getHours_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCHours_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = HourFromTime(result);

    args.rval().setNumber(result);
    return JS_TRUE;
}

static JSBool
date_getUTCHours(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCHours_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getMinutes_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_MINUTES));
    return true;
}

static JSBool
date_getMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getMinutes_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getUTCMinutes_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = MinFromTime(result);

    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getUTCMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCMinutes_impl>(cx, args);
}

/* Date.getSeconds is mapped to getUTCSeconds */

JS_ALWAYS_INLINE bool
date_getUTCSeconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    FillLocalTimeSlots(&cx->runtime->dateTimeInfo, thisObj);

    args.rval().set(thisObj->getSlot(JSObject::JSSLOT_DATE_LOCAL_SECONDS));
    return true;
}

static JSBool
date_getUTCSeconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCSeconds_impl>(cx, args);
}

/* Date.getMilliseconds is mapped to getUTCMilliseconds */

JS_ALWAYS_INLINE bool
date_getUTCMilliseconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double result = args.thisv().toObject().getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = msFromTime(result);

    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getUTCMilliseconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getUTCMilliseconds_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_getTimezoneOffset_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();
    double utctime = thisObj->getDateUTCTime().toNumber();
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, thisObj);

    /*
     * Return the time zone offset in minutes for the current locale that is
     * appropriate for this time. This value would be a constant except for
     * daylight savings time.
     */
    double result = (utctime - localtime) / msPerMinute;
    args.rval().setNumber(result);
    return true;
}

static JSBool
date_getTimezoneOffset(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_getTimezoneOffset_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setTime_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());
    if (args.length() == 0) {
        SetUTCTime(thisObj, js_NaN, args.rval().address());
        return true;
    }

    double result;
    if (!ToNumber(cx, args[0], &result))
        return false;

    SetUTCTime(thisObj, TimeClip(result), args.rval().address());
    return true;
}

static JSBool
date_setTime(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setTime_impl>(cx, args);
}

static bool
GetMsecsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *millis)
{
    if (args.length() <= i) {
        *millis = msFromTime(t);
        return true;
    }
    return ToNumber(cx, args[i], millis);
}

static bool
GetSecsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *sec)
{
    if (args.length() <= i) {
        *sec = SecFromTime(t);
        return true;
    }
    return ToNumber(cx, args[i], sec);
}

static bool
GetMinsOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *mins)
{
    if (args.length() <= i) {
        *mins = MinFromTime(t);
        return true;
    }
    return ToNumber(cx, args[i], mins);
}

/* ES5 15.9.5.28. */
JS_ALWAYS_INLINE bool
date_setMilliseconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double milli;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &milli))
        return false;
    double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);

    /* Step 3. */
    double u = TimeClip(UTC(MakeDate(Day(t), time), &cx->runtime->dateTimeInfo));

    /* Steps 4-5. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

static JSBool
date_setMilliseconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setMilliseconds_impl>(cx, args);
}

/* ES5 15.9.5.29. */
JS_ALWAYS_INLINE bool
date_setUTCMilliseconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double milli;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &milli))
        return false;
    double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);

    /* Step 3. */
    double v = TimeClip(MakeDate(Day(t), time));

    /* Steps 4-5. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

static JSBool
date_setUTCMilliseconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCMilliseconds_impl>(cx, args);
}

/* ES5 15.9.5.30. */
JS_ALWAYS_INLINE bool
date_setSeconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double s;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &s))
        return false;

    /* Step 3. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 1, t, &milli))
        return false;

    /* Step 4. */
    double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

    /* Step 5. */
    double u = TimeClip(UTC(date, &cx->runtime->dateTimeInfo));

    /* Steps 6-7. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

/* ES5 15.9.5.31. */
static JSBool
date_setSeconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setSeconds_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setUTCSeconds_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double s;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &s))
        return false;

    /* Step 3. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 1, t, &milli))
        return false;

    /* Step 4. */
    double date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

    /* Step 5. */
    double v = TimeClip(date);

    /* Steps 6-7. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

/* ES5 15.9.5.32. */
static JSBool
date_setUTCSeconds(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCSeconds_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setMinutes_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double m;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &m))
        return false;

    /* Step 3. */
    double s;
    if (!GetSecsOrDefault(cx, args, 1, t, &s))
        return false;

    /* Step 4. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 2, t, &milli))
        return false;

    /* Step 5. */
    double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

    /* Step 6. */
    double u = TimeClip(UTC(date, &cx->runtime->dateTimeInfo));

    /* Steps 7-8. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

/* ES5 15.9.5.33. */
static JSBool
date_setMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setMinutes_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setUTCMinutes_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double m;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &m))
        return false;

    /* Step 3. */
    double s;
    if (!GetSecsOrDefault(cx, args, 1, t, &s))
        return false;

    /* Step 4. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 2, t, &milli))
        return false;

    /* Step 5. */
    double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

    /* Step 6. */
    double v = TimeClip(date);

    /* Steps 7-8. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

/* ES5 15.9.5.34. */
static JSBool
date_setUTCMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCMinutes_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setHours_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double h;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &h))
        return false;

    /* Step 3. */
    double m;
    if (!GetMinsOrDefault(cx, args, 1, t, &m))
        return false;

    /* Step 4. */
    double s;
    if (!GetSecsOrDefault(cx, args, 2, t, &s))
        return false;

    /* Step 5. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 3, t, &milli))
        return false;

    /* Step 6. */
    double date = MakeDate(Day(t), MakeTime(h, m, s, milli));

    /* Step 6. */
    double u = TimeClip(UTC(date, &cx->runtime->dateTimeInfo));

    /* Steps 7-8. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

/* ES5 15.9.5.35. */
static JSBool
date_setHours(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setHours_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setUTCHours_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double h;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &h))
        return false;

    /* Step 3. */
    double m;
    if (!GetMinsOrDefault(cx, args, 1, t, &m))
        return false;

    /* Step 4. */
    double s;
    if (!GetSecsOrDefault(cx, args, 2, t, &s))
        return false;

    /* Step 5. */
    double milli;
    if (!GetMsecsOrDefault(cx, args, 3, t, &milli))
        return false;

    /* Step 6. */
    double newDate = MakeDate(Day(t), MakeTime(h, m, s, milli));

    /* Step 7. */
    double v = TimeClip(newDate);

    /* Steps 8-9. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

/* ES5 15.9.5.36. */
static JSBool
date_setUTCHours(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCHours_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setDate_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double dt;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &dt))
        return false;

    /* Step 3. */
    double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), dt), TimeWithinDay(t));

    /* Step 4. */
    double u = TimeClip(UTC(newDate, &cx->runtime->dateTimeInfo));

    /* Steps 5-6. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

/* ES5 15.9.5.37. */
static JSBool
date_setDate(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setDate_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_setUTCDate_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double dt;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &dt))
        return false;

    /* Step 3. */
    double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), dt), TimeWithinDay(t));

    /* Step 4. */
    double v = TimeClip(newDate);

    /* Steps 5-6. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

static JSBool
date_setUTCDate(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCDate_impl>(cx, args);
}

static bool
GetDateOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *date)
{
    if (args.length() <= i) {
        *date = DateFromTime(t);
        return true;
    }
    return ToNumber(cx, args[i], date);
}

static bool
GetMonthOrDefault(JSContext *cx, const CallArgs &args, unsigned i, double t, double *month)
{
    if (args.length() <= i) {
        *month = MonthFromTime(t);
        return true;
    }
    return ToNumber(cx, args[i], month);
}

/* ES5 15.9.5.38. */
JS_ALWAYS_INLINE bool
date_setMonth_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = LocalTime(thisObj->getDateUTCTime().toNumber(), &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double m;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &m))
        return false;

    /* Step 3. */
    double dt;
    if (!GetDateOrDefault(cx, args, 1, t, &dt))
        return false;

    /* Step 4. */
    double newDate = MakeDate(MakeDay(YearFromTime(t), m, dt), TimeWithinDay(t));

    /* Step 5. */
    double u = TimeClip(UTC(newDate, &cx->runtime->dateTimeInfo));

    /* Steps 6-7. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

static JSBool
date_setMonth(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setMonth_impl>(cx, args);
}

/* ES5 15.9.5.39. */
JS_ALWAYS_INLINE bool
date_setUTCMonth_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = thisObj->getDateUTCTime().toNumber();

    /* Step 2. */
    double m;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &m))
        return false;

    /* Step 3. */
    double dt;
    if (!GetDateOrDefault(cx, args, 1, t, &dt))
        return false;

    /* Step 4. */
    double newDate = MakeDate(MakeDay(YearFromTime(t), m, dt), TimeWithinDay(t));

    /* Step 5. */
    double v = TimeClip(newDate);

    /* Steps 6-7. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

static JSBool
date_setUTCMonth(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCMonth_impl>(cx, args);
}

static double
ThisLocalTimeOrZero(HandleObject date, DateTimeInfo *dtInfo)
{
    double t = date->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_NaN(t))
        return +0;
    return LocalTime(t, dtInfo);
}

static double
ThisUTCTimeOrZero(HandleObject date)
{
    double t = date->getDateUTCTime().toNumber();
    return MOZ_DOUBLE_IS_NaN(t) ? +0 : t;
}

/* ES5 15.9.5.40. */
JS_ALWAYS_INLINE bool
date_setFullYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = ThisLocalTimeOrZero(thisObj, &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double y;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &y))
        return false;

    /* Step 3. */
    double m;
    if (!GetMonthOrDefault(cx, args, 1, t, &m))
        return false;

    /* Step 4. */
    double dt;
    if (!GetDateOrDefault(cx, args, 2, t, &dt))
        return false;

    /* Step 5. */
    double newDate = MakeDate(MakeDay(y, m, dt), TimeWithinDay(t));

    /* Step 6. */
    double u = TimeClip(UTC(newDate, &cx->runtime->dateTimeInfo));

    /* Steps 7-8. */
    SetUTCTime(thisObj, u, args.rval().address());
    return true;
}

static JSBool
date_setFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setFullYear_impl>(cx, args);
}

/* ES5 15.9.5.41. */
JS_ALWAYS_INLINE bool
date_setUTCFullYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = ThisUTCTimeOrZero(thisObj);

    /* Step 2. */
    double y;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &y))
        return false;

    /* Step 3. */
    double m;
    if (!GetMonthOrDefault(cx, args, 1, t, &m))
        return false;

    /* Step 4. */
    double dt;
    if (!GetDateOrDefault(cx, args, 2, t, &dt))
        return false;

    /* Step 5. */
    double newDate = MakeDate(MakeDay(y, m, dt), TimeWithinDay(t));

    /* Step 6. */
    double v = TimeClip(newDate);

    /* Steps 7-8. */
    SetUTCTime(thisObj, v, args.rval().address());
    return true;
}

static JSBool
date_setUTCFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setUTCFullYear_impl>(cx, args);
}

/* ES5 Annex B.2.5. */
JS_ALWAYS_INLINE bool
date_setYear_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    /* Step 1. */
    double t = ThisLocalTimeOrZero(thisObj, &cx->runtime->dateTimeInfo);

    /* Step 2. */
    double y;
    if (!ToNumber(cx, args.length() > 0 ? args[0] : UndefinedValue(), &y))
        return false;

    /* Step 3. */
    if (MOZ_DOUBLE_IS_NaN(y)) {
        SetUTCTime(thisObj, js_NaN, args.rval().address());
        return true;
    }

    /* Step 4. */
    double yint = ToInteger(y);
    if (0 <= yint && yint <= 99)
        yint += 1900;

    /* Step 5. */
    double day = MakeDay(yint, MonthFromTime(t), DateFromTime(t));

    /* Step 6. */
    double u = UTC(MakeDate(day, TimeWithinDay(t)), &cx->runtime->dateTimeInfo);

    /* Steps 7-8. */
    SetUTCTime(thisObj, TimeClip(u), args.rval().address());
    return true;
}

static JSBool
date_setYear(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_setYear_impl>(cx, args);
}

/* constants for toString, toUTCString */
static char js_NaN_date_str[] = "Invalid Date";
static const char* days[] =
{
   "Sun","Mon","Tue","Wed","Thu","Fri","Sat"
};
static const char* months[] =
{
   "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};


// Avoid dependence on PRMJ_FormatTimeUSEnglish, because it
// requires a PRMJTime... which only has 16-bit years.  Sub-ECMA.
static void
print_gmt_string(char* buf, size_t size, double utctime)
{
    JS_ASSERT(TimeClip(utctime) == utctime);
    JS_snprintf(buf, size, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
                days[int(WeekDay(utctime))],
                int(DateFromTime(utctime)),
                months[int(MonthFromTime(utctime))],
                int(YearFromTime(utctime)),
                int(HourFromTime(utctime)),
                int(MinFromTime(utctime)),
                int(SecFromTime(utctime)));
}

static void
print_iso_string(char* buf, size_t size, double utctime)
{
    JS_ASSERT(TimeClip(utctime) == utctime);
    JS_snprintf(buf, size, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ",
                int(YearFromTime(utctime)),
                int(MonthFromTime(utctime)) + 1,
                int(DateFromTime(utctime)),
                int(HourFromTime(utctime)),
                int(MinFromTime(utctime)),
                int(SecFromTime(utctime)),
                int(msFromTime(utctime)));
}

/* ES5 B.2.6. */
JS_ALWAYS_INLINE bool
date_toGMTString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double utctime = args.thisv().toObject().getDateUTCTime().toNumber();

    char buf[100];
    if (!MOZ_DOUBLE_IS_FINITE(utctime))
        JS_snprintf(buf, sizeof buf, js_NaN_date_str);
    else
        print_gmt_string(buf, sizeof buf, utctime);

    JSString *str = JS_NewStringCopyZ(cx, buf);
    if (!str)
        return false;
    args.rval().setString(str);
    return true;
}

/* ES5 15.9.5.43. */
static JSBool
date_toGMTString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toGMTString_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_toISOString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    double utctime = args.thisv().toObject().getDateUTCTime().toNumber();
    if (!MOZ_DOUBLE_IS_FINITE(utctime)) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INVALID_DATE);
        return false;
    }

    char buf[100];
    print_iso_string(buf, sizeof buf, utctime);

    JSString *str = JS_NewStringCopyZ(cx, buf);
    if (!str)
        return false;
    args.rval().setString(str);
    return true;

}

static JSBool
date_toISOString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toISOString_impl>(cx, args);
}

/* ES5 15.9.5.44. */
static JSBool
date_toJSON(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    /* Step 1. */
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    /* Step 2. */
    RootedValue tv(cx, ObjectValue(*obj));
    if (!ToPrimitive(cx, JSTYPE_NUMBER, &tv))
        return false;

    /* Step 3. */
    if (tv.isDouble() && !MOZ_DOUBLE_IS_FINITE(tv.toDouble())) {
        args.rval().setNull();
        return true;
    }

    /* Step 4. */
    RootedValue toISO(cx);
    if (!JSObject::getProperty(cx, obj, obj, cx->names().toISOString, &toISO))
        return false;

    /* Step 5. */
    if (!js_IsCallable(toISO)) {
        JS_ReportErrorFlagsAndNumber(cx, JSREPORT_ERROR, js_GetErrorMessage, NULL,
                                     JSMSG_BAD_TOISOSTRING_PROP);
        return false;
    }

    /* Step 6. */
    InvokeArgsGuard ag;
    if (!cx->stack.pushInvokeArgs(cx, 0, &ag))
        return false;

    ag.setCallee(toISO);
    ag.setThis(ObjectValue(*obj));

    if (!Invoke(cx, ag))
        return false;
    args.rval().set(ag.rval());
    return true;
}

/* for Date.toLocaleFormat; interface to PRMJTime date struct.
 */
static void
new_explode(double timeval, PRMJTime *split, DateTimeInfo *dtInfo)
{
    double year = YearFromTime(timeval);

    split->tm_usec = int32_t(msFromTime(timeval)) * 1000;
    split->tm_sec = int8_t(SecFromTime(timeval));
    split->tm_min = int8_t(MinFromTime(timeval));
    split->tm_hour = int8_t(HourFromTime(timeval));
    split->tm_mday = int8_t(DateFromTime(timeval));
    split->tm_mon = int8_t(MonthFromTime(timeval));
    split->tm_wday = int8_t(WeekDay(timeval));
    split->tm_year = year;
    split->tm_yday = int16_t(DayWithinYear(timeval, year));

    /* not sure how this affects things, but it doesn't seem
       to matter. */
    split->tm_isdst = (DaylightSavingTA(timeval, dtInfo) != 0);
}

typedef enum formatspec {
    FORMATSPEC_FULL, FORMATSPEC_DATE, FORMATSPEC_TIME
} formatspec;

/* helper function */
static JSBool
date_format(JSContext *cx, double date, formatspec format, MutableHandleValue rval)
{
    char buf[100];
    char tzbuf[100];
    JSBool usetz;
    size_t i, tzlen;
    PRMJTime split;

    if (!MOZ_DOUBLE_IS_FINITE(date)) {
        JS_snprintf(buf, sizeof buf, js_NaN_date_str);
    } else {
        JS_ASSERT(TimeClip(date) == date);

        double local = LocalTime(date, &cx->runtime->dateTimeInfo);

        /* offset from GMT in minutes.  The offset includes daylight savings,
           if it applies. */
        int minutes = (int) floor(AdjustTime(date, &cx->runtime->dateTimeInfo) / msPerMinute);

        /* map 510 minutes to 0830 hours */
        int offset = (minutes / 60) * 100 + minutes % 60;

        /* print as "Wed Nov 05 19:38:03 GMT-0800 (PST) 1997" The TZA is
         * printed as 'GMT-0800' rather than as 'PST' to avoid
         * operating-system dependence on strftime (which
         * PRMJ_FormatTimeUSEnglish calls, for %Z only.)  win32 prints
         * PST as 'Pacific Standard Time.'  This way we always know
         * what we're getting, and can parse it if we produce it.
         * The OS TZA string is included as a comment.
         */

        /* get a timezone string from the OS to include as a
           comment. */
        new_explode(date, &split, &cx->runtime->dateTimeInfo);
        if (PRMJ_FormatTime(tzbuf, sizeof tzbuf, "(%Z)", &split) != 0) {

            /* Decide whether to use the resulting timezone string.
             *
             * Reject it if it contains any non-ASCII, non-alphanumeric
             * characters.  It's then likely in some other character
             * encoding, and we probably won't display it correctly.
             */
            usetz = JS_TRUE;
            tzlen = strlen(tzbuf);
            if (tzlen > 100) {
                usetz = JS_FALSE;
            } else {
                for (i = 0; i < tzlen; i++) {
                    jschar c = tzbuf[i];
                    if (c > 127 ||
                        !(isalpha(c) || isdigit(c) ||
                          c == ' ' || c == '(' || c == ')')) {
                        usetz = JS_FALSE;
                    }
                }
            }

            /* Also reject it if it's not parenthesized or if it's '()'. */
            if (tzbuf[0] != '(' || tzbuf[1] == ')')
                usetz = JS_FALSE;
        } else
            usetz = JS_FALSE;

        switch (format) {
          case FORMATSPEC_FULL:
            /*
             * Avoid dependence on PRMJ_FormatTimeUSEnglish, because it
             * requires a PRMJTime... which only has 16-bit years.  Sub-ECMA.
             */
            /* Tue Oct 31 2000 09:41:40 GMT-0800 (PST) */
            JS_snprintf(buf, sizeof buf,
                        "%s %s %.2d %.4d %.2d:%.2d:%.2d GMT%+.4d%s%s",
                        days[int(WeekDay(local))],
                        months[int(MonthFromTime(local))],
                        int(DateFromTime(local)),
                        int(YearFromTime(local)),
                        int(HourFromTime(local)),
                        int(MinFromTime(local)),
                        int(SecFromTime(local)),
                        offset,
                        usetz ? " " : "",
                        usetz ? tzbuf : "");
            break;
          case FORMATSPEC_DATE:
            /* Tue Oct 31 2000 */
            JS_snprintf(buf, sizeof buf,
                        "%s %s %.2d %.4d",
                        days[int(WeekDay(local))],
                        months[int(MonthFromTime(local))],
                        int(DateFromTime(local)),
                        int(YearFromTime(local)));
            break;
          case FORMATSPEC_TIME:
            /* 09:41:40 GMT-0800 (PST) */
            JS_snprintf(buf, sizeof buf,
                        "%.2d:%.2d:%.2d GMT%+.4d%s%s",
                        int(HourFromTime(local)),
                        int(MinFromTime(local)),
                        int(SecFromTime(local)),
                        offset,
                        usetz ? " " : "",
                        usetz ? tzbuf : "");
            break;
        }
    }

    JSString *str = JS_NewStringCopyZ(cx, buf);
    if (!str)
        return false;
    rval.setString(str);
    return true;
}

static bool
ToLocaleFormatHelper(JSContext *cx, HandleObject obj, const char *format, MutableHandleValue rval)
{
    double utctime = obj->getDateUTCTime().toNumber();

    char buf[100];
    if (!MOZ_DOUBLE_IS_FINITE(utctime)) {
        JS_snprintf(buf, sizeof buf, js_NaN_date_str);
    } else {
        int result_len;
        double local = LocalTime(utctime, &cx->runtime->dateTimeInfo);
        PRMJTime split;
        new_explode(local, &split, &cx->runtime->dateTimeInfo);

        /* Let PRMJTime format it. */
        result_len = PRMJ_FormatTime(buf, sizeof buf, format, &split);

        /* If it failed, default to toString. */
        if (result_len == 0)
            return date_format(cx, utctime, FORMATSPEC_FULL, rval);

        /* Hacked check against undesired 2-digit year 00/00/00 form. */
        if (strcmp(format, "%x") == 0 && result_len >= 6 &&
            /* Format %x means use OS settings, which may have 2-digit yr, so
               hack end of 3/11/22 or 11.03.22 or 11Mar22 to use 4-digit yr...*/
            !isdigit(buf[result_len - 3]) &&
            isdigit(buf[result_len - 2]) && isdigit(buf[result_len - 1]) &&
            /* ...but not if starts with 4-digit year, like 2022/3/11. */
            !(isdigit(buf[0]) && isdigit(buf[1]) &&
              isdigit(buf[2]) && isdigit(buf[3]))) {
            JS_snprintf(buf + (result_len - 2), (sizeof buf) - (result_len - 2),
                        "%d", js_DateGetYear(cx, obj));
        }

    }

    if (cx->runtime->localeCallbacks && cx->runtime->localeCallbacks->localeToUnicode)
        return cx->runtime->localeCallbacks->localeToUnicode(cx, buf, rval);

    JSString *str = JS_NewStringCopyZ(cx, buf);
    if (!str)
        return false;
    rval.setString(str);
    return true;
}

#if !ENABLE_INTL_API
static bool
ToLocaleStringHelper(JSContext *cx, HandleObject thisObj, MutableHandleValue rval)
{
    /*
     * Use '%#c' for windows, because '%c' is backward-compatible and non-y2k
     * with msvc; '%#c' requests that a full year be used in the result string.
     */
    return ToLocaleFormatHelper(cx, thisObj,
#if defined(_WIN32) && !defined(__MWERKS__)
                          "%#c"
#else
                          "%c"
#endif
                         , rval);
}

/* ES5 15.9.5.5. */
JS_ALWAYS_INLINE bool
date_toLocaleString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());
    return ToLocaleStringHelper(cx, thisObj, args.rval());
}

static JSBool
date_toLocaleString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toLocaleString_impl>(cx, args);
}

/* ES5 15.9.5.6. */
JS_ALWAYS_INLINE bool
date_toLocaleDateString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    /*
     * Use '%#x' for windows, because '%x' is backward-compatible and non-y2k
     * with msvc; '%#x' requests that a full year be used in the result string.
     */
    static const char format[] =
#if defined(_WIN32) && !defined(__MWERKS__)
                                   "%#x"
#else
                                   "%x"
#endif
                                   ;

    RootedObject thisObj(cx, &args.thisv().toObject());
    return ToLocaleFormatHelper(cx, thisObj, format, args.rval());
}

static JSBool
date_toLocaleDateString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toLocaleDateString_impl>(cx, args);
}

/* ES5 15.9.5.7. */
JS_ALWAYS_INLINE bool
date_toLocaleTimeString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());
    return ToLocaleFormatHelper(cx, thisObj, "%X", args.rval());
}

static JSBool
date_toLocaleTimeString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toLocaleTimeString_impl>(cx, args);
}
#endif

JS_ALWAYS_INLINE bool
date_toLocaleFormat_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    RootedObject thisObj(cx, &args.thisv().toObject());

    if (args.length() == 0) {
        /*
         * Use '%#c' for windows, because '%c' is backward-compatible and non-y2k
         * with msvc; '%#c' requests that a full year be used in the result string.
         */
        return ToLocaleFormatHelper(cx, thisObj,
#if defined(_WIN32) && !defined(__MWERKS__)
                              "%#c"
#else
                              "%c"
#endif
                             , args.rval());
    }

    RootedString fmt(cx, ToString<CanGC>(cx, args[0]));
    if (!fmt)
        return false;

    JSAutoByteString fmtbytes(cx, fmt);
    if (!fmtbytes)
        return false;

    return ToLocaleFormatHelper(cx, thisObj, fmtbytes.ptr(), args.rval());
}

static JSBool
date_toLocaleFormat(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toLocaleFormat_impl>(cx, args);
}

/* ES5 15.9.5.4. */
JS_ALWAYS_INLINE bool
date_toTimeString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    return date_format(cx, args.thisv().toObject().getDateUTCTime().toNumber(),
                       FORMATSPEC_TIME, args.rval());
}

static JSBool
date_toTimeString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toTimeString_impl>(cx, args);
}

/* ES5 15.9.5.3. */
JS_ALWAYS_INLINE bool
date_toDateString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    return date_format(cx, args.thisv().toObject().getDateUTCTime().toNumber(),
                       FORMATSPEC_DATE, args.rval());
}

static JSBool
date_toDateString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toDateString_impl>(cx, args);
}

#if JS_HAS_TOSOURCE
JS_ALWAYS_INLINE bool
date_toSource_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    StringBuffer sb(cx);
    if (!sb.append("(new Date(") ||
        !NumberValueToStringBuffer(cx, args.thisv().toObject().getDateUTCTime(), sb) ||
        !sb.append("))"))
    {
        return false;
    }

    JSString *str = sb.finishString();
    if (!str)
        return false;
    args.rval().setString(str);
    return true;
}

static JSBool
date_toSource(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toSource_impl>(cx, args);
}
#endif

JS_ALWAYS_INLINE bool
date_toString_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));
    return date_format(cx, args.thisv().toObject().getDateUTCTime().toNumber(),
                       FORMATSPEC_FULL, args.rval());
}

static JSBool
date_toString(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_toString_impl>(cx, args);
}

JS_ALWAYS_INLINE bool
date_valueOf_impl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(IsDate(args.thisv()));

    JSObject *thisObj = &args.thisv().toObject();

    args.rval().set(thisObj->getDateUTCTime());
    return true;
}

static JSBool
date_valueOf(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return CallNonGenericMethod<IsDate, date_valueOf_impl>(cx, args);
}

static const JSFunctionSpec date_static_methods[] = {
    JS_FN("UTC",                 date_UTC,                MAXARGS,0),
    JS_FN("parse",               date_parse,              1,0),
    JS_FN("now",                 date_now,                0,0),
    JS_FS_END
};

static const JSFunctionSpec date_methods[] = {
    JS_FN("getTime",             date_getTime,            0,0),
    JS_FN("getTimezoneOffset",   date_getTimezoneOffset,  0,0),
    JS_FN("getYear",             date_getYear,            0,0),
    JS_FN("getFullYear",         date_getFullYear,        0,0),
    JS_FN("getUTCFullYear",      date_getUTCFullYear,     0,0),
    JS_FN("getMonth",            date_getMonth,           0,0),
    JS_FN("getUTCMonth",         date_getUTCMonth,        0,0),
    JS_FN("getDate",             date_getDate,            0,0),
    JS_FN("getUTCDate",          date_getUTCDate,         0,0),
    JS_FN("getDay",              date_getDay,             0,0),
    JS_FN("getUTCDay",           date_getUTCDay,          0,0),
    JS_FN("getHours",            date_getHours,           0,0),
    JS_FN("getUTCHours",         date_getUTCHours,        0,0),
    JS_FN("getMinutes",          date_getMinutes,         0,0),
    JS_FN("getUTCMinutes",       date_getUTCMinutes,      0,0),
    JS_FN("getSeconds",          date_getUTCSeconds,      0,0),
    JS_FN("getUTCSeconds",       date_getUTCSeconds,      0,0),
    JS_FN("getMilliseconds",     date_getUTCMilliseconds, 0,0),
    JS_FN("getUTCMilliseconds",  date_getUTCMilliseconds, 0,0),
    JS_FN("setTime",             date_setTime,            1,0),
    JS_FN("setYear",             date_setYear,            1,0),
    JS_FN("setFullYear",         date_setFullYear,        3,0),
    JS_FN("setUTCFullYear",      date_setUTCFullYear,     3,0),
    JS_FN("setMonth",            date_setMonth,           2,0),
    JS_FN("setUTCMonth",         date_setUTCMonth,        2,0),
    JS_FN("setDate",             date_setDate,            1,0),
    JS_FN("setUTCDate",          date_setUTCDate,         1,0),
    JS_FN("setHours",            date_setHours,           4,0),
    JS_FN("setUTCHours",         date_setUTCHours,        4,0),
    JS_FN("setMinutes",          date_setMinutes,         3,0),
    JS_FN("setUTCMinutes",       date_setUTCMinutes,      3,0),
    JS_FN("setSeconds",          date_setSeconds,         2,0),
    JS_FN("setUTCSeconds",       date_setUTCSeconds,      2,0),
    JS_FN("setMilliseconds",     date_setMilliseconds,    1,0),
    JS_FN("setUTCMilliseconds",  date_setUTCMilliseconds, 1,0),
    JS_FN("toUTCString",         date_toGMTString,        0,0),
    JS_FN("toLocaleFormat",      date_toLocaleFormat,     0,0),
#if ENABLE_INTL_API
         {js_toLocaleString_str, {NULL, NULL},            0,0, "Date_toLocaleString"},
         {"toLocaleDateString",  {NULL, NULL},            0,0, "Date_toLocaleDateString"},
         {"toLocaleTimeString",  {NULL, NULL},            0,0, "Date_toLocaleTimeString"},
#else
    JS_FN(js_toLocaleString_str, date_toLocaleString,     0,0),
    JS_FN("toLocaleDateString",  date_toLocaleDateString, 0,0),
    JS_FN("toLocaleTimeString",  date_toLocaleTimeString, 0,0),
#endif
    JS_FN("toDateString",        date_toDateString,       0,0),
    JS_FN("toTimeString",        date_toTimeString,       0,0),
    JS_FN("toISOString",         date_toISOString,        0,0),
    JS_FN(js_toJSON_str,         date_toJSON,             1,0),
#if JS_HAS_TOSOURCE
    JS_FN(js_toSource_str,       date_toSource,           0,0),
#endif
    JS_FN(js_toString_str,       date_toString,           0,0),
    JS_FN(js_valueOf_str,        date_valueOf,            0,0),
    JS_FS_END
};

JSBool
js_Date(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    /* Date called as function. */
    if (!IsConstructing(args))
        return date_format(cx, NowAsMillis(), FORMATSPEC_FULL, args.rval());

    /* Date called as constructor. */
    double d;
    if (args.length() == 0) {
        /* ES5 15.9.3.3. */
        d = NowAsMillis();
    } else if (args.length() == 1) {
        /* ES5 15.9.3.2. */

        /* Step 1. */
        if (!ToPrimitive(cx, args.handleAt(0)))
            return false;

        if (args[0].isString()) {
            /* Step 2. */
            JSString *str = args[0].toString();
            if (!str)
                return false;

            JSLinearString *linearStr = str->ensureLinear(cx);
            if (!linearStr)
                return false;

            if (!date_parseString(linearStr, &d, &cx->runtime->dateTimeInfo))
                d = js_NaN;
            else
                d = TimeClip(d);
        } else {
            /* Step 3. */
            if (!ToNumber(cx, args[0], &d))
                return false;
            d = TimeClip(d);
        }
    } else {
        double msec_time;
        if (!date_msecFromArgs(cx, args, &msec_time))
            return false;

        if (MOZ_DOUBLE_IS_FINITE(msec_time)) {
            msec_time = UTC(msec_time, &cx->runtime->dateTimeInfo);
            msec_time = TimeClip(msec_time);
        }
        d = msec_time;
    }

    JSObject *obj = js_NewDateObjectMsec(cx, d);
    if (!obj)
        return false;

    args.rval().setObject(*obj);
    return true;
}

JSObject *
js_InitDateClass(JSContext *cx, HandleObject obj)
{
    JS_ASSERT(obj->isNative());

    Rooted<GlobalObject*> global(cx, &obj->asGlobal());

    RootedObject dateProto(cx, global->createBlankPrototype(cx, &DateClass));
    if (!dateProto)
        return NULL;
    SetUTCTime(dateProto, js_NaN);

    RootedFunction ctor(cx);
    ctor = global->createConstructor(cx, js_Date, cx->names().Date, MAXARGS);
    if (!ctor)
        return NULL;

    if (!LinkConstructorAndPrototype(cx, ctor, dateProto))
        return NULL;

    if (!DefinePropertiesAndBrand(cx, ctor, NULL, date_static_methods))
        return NULL;

    /*
     * Define all Date.prototype.* functions, then brand for trace-jitted code.
     * Date.prototype.toGMTString has the same initial value as
     * Date.prototype.toUTCString.
     */
    if (!JS_DefineFunctions(cx, dateProto, date_methods))
        return NULL;
    RootedValue toUTCStringFun(cx);
    RootedId toUTCStringId(cx, NameToId(cx->names().toUTCString));
    RootedId toGMTStringId(cx, NameToId(cx->names().toGMTString));
    if (!baseops::GetProperty(cx, dateProto, toUTCStringId, &toUTCStringFun) ||
        !baseops::DefineGeneric(cx, dateProto, toGMTStringId, toUTCStringFun,
                                JS_PropertyStub, JS_StrictPropertyStub, 0))
    {
        return NULL;
    }

    if (!DefineConstructorAndPrototype(cx, global, JSProto_Date, ctor, dateProto))
        return NULL;

    return dateProto;
}

JS_FRIEND_API(JSObject *)
js_NewDateObjectMsec(JSContext *cx, double msec_time)
{
    JSObject *obj = NewBuiltinClassInstance(cx, &DateClass);
    if (!obj)
        return NULL;
    SetUTCTime(obj, msec_time);
    return obj;
}

JS_FRIEND_API(JSObject *)
js_NewDateObject(JSContext *cx, int year, int mon, int mday,
                 int hour, int min, int sec)
{
    JS_ASSERT(mon < 12);
    double msec_time = date_msecFromDate(year, mon, mday, hour, min, sec, 0);
    return js_NewDateObjectMsec(cx, UTC(msec_time, &cx->runtime->dateTimeInfo));
}

JS_FRIEND_API(JSBool)
js_DateIsValid(JSObject *obj)
{
    return obj->isDate() && !MOZ_DOUBLE_IS_NaN(obj->getDateUTCTime().toNumber());
}

JS_FRIEND_API(int)
js_DateGetYear(JSContext *cx, JSObject *obj)
{
    /* Preserve legacy API behavior of returning 0 for invalid dates. */
    JS_ASSERT(obj);
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, obj);
    if (MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) YearFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetMonth(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj);
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, obj);
    if (MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) MonthFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetDate(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj);
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, obj);
    if (MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) DateFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetHours(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj);
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, obj);
    if (MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) HourFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetMinutes(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj);
    double localtime = GetCachedLocalTime(&cx->runtime->dateTimeInfo, obj);
    if (MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) MinFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetSeconds(JSObject *obj)
{
    if (!obj->isDate())
        return 0;

    double utctime = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_NaN(utctime))
        return 0;
    return (int) SecFromTime(utctime);
}

JS_FRIEND_API(double)
js_DateGetMsecSinceEpoch(JSObject *obj)
{
    return obj->isDate() ? obj->getDateUTCTime().toNumber() : 0;
}


static const NativeImpl sReadOnlyDateMethods[] = {
    date_getTime_impl,
    date_getYear_impl,
    date_getFullYear_impl,
    date_getUTCFullYear_impl,
    date_getMonth_impl,
    date_getUTCMonth_impl,
    date_getDate_impl,
    date_getUTCDate_impl,
    date_getDay_impl,
    date_getUTCDay_impl,
    date_getHours_impl,
    date_getUTCHours_impl,
    date_getMinutes_impl,
    date_getUTCMinutes_impl,
    date_getUTCSeconds_impl,
    date_getUTCMilliseconds_impl,
    date_getTimezoneOffset_impl,
    date_toGMTString_impl,
    date_toISOString_impl,
    date_toLocaleFormat_impl,
    date_toTimeString_impl,
    date_toDateString_impl,
    date_toSource_impl,
    date_toString_impl,
    date_valueOf_impl
};

JS_FRIEND_API(bool)
js::IsReadOnlyDateMethod(IsAcceptableThis test, NativeImpl method)
{
    /* Avoid a linear search in the common case by checking the |this| test. */
    if (test != IsDate)
        return false;

    /* Linear search, comparing function pointers. */
    unsigned max = sizeof(sReadOnlyDateMethods) / sizeof(sReadOnlyDateMethods[0]);
    for (unsigned i = 0; i < max; ++i) {
        if (method == sReadOnlyDateMethods[i])
            return true;
    }
    return false;
}