gecko/js/src/jsdate.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sw=4 et tw=78:
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * JS date methods.
 */

#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 <stdlib.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 "jsdate.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsstr.h"
#include "jslibmath.h"

#include "vm/GlobalObject.h"
#include "vm/StringBuffer.h"

#include "jsinferinlines.h"
#include "jsobjinlines.h"

#include "vm/MethodGuard-inl.h"
#include "vm/Stack-inl.h"

using namespace mozilla;
using namespace js;
using namespace js::types;

/*
 * The JS 'Date' object is patterned after the Java 'Date' object.
 * Here is an 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
 */

/*
 * 11/97 - jsdate.c has been rewritten to conform to the ECMA-262 language
 * definition and reduce dependence on NSPR.  NSPR is used to get the current
 * time in milliseconds, the time zone offset, and the daylight savings time
 * offset for a given time.  NSPR is also used for Date.toLocaleString(), for
 * locale-specific formatting, and to get a string representing the timezone.
 * (Which turns out to be platform-dependent.)
 *
 * To do:
 * (I did some performance tests by timing how long it took to run what
 *  I had of the js ECMA conformance tests.)
 *
 * - look at saving results across multiple calls to supporting
 * functions; the toString functions compute some of the same values
 * multiple times.  Although - I took a quick stab at this, and I lost
 * rather than gained.  (Fractionally.)  Hard to tell what compilers/processors
 * are doing these days.
 *
 * - look at tweaking function return types to return double instead
 * of int; this seems to make things run slightly faster sometimes.
 * (though it could be architecture-dependent.)  It'd be good to see
 * how this does on win32.  (Tried it on irix.)  Types could use a
 * general going-over.
 */

/*
 * Supporting functions - ECMA 15.9.1.*
 */

#define HoursPerDay     24.0
#define MinutesPerDay   (HoursPerDay * MinutesPerHour)
#define MinutesPerHour  60.0
#define SecondsPerDay   (MinutesPerDay * SecondsPerMinute)
#define SecondsPerHour  (MinutesPerHour * SecondsPerMinute)
#define SecondsPerMinute 60.0

#if defined(XP_WIN) || defined(XP_OS2)
/* Work around msvc double optimization bug by making these runtime values; if
 * they're available at compile time, msvc optimizes division by them by
 * computing the reciprocal and multiplying instead of dividing - this loses
 * when the reciprocal isn't representable in a double.
 */
static double msPerSecond = 1000.0;
static double msPerDay = SecondsPerDay * 1000.0;
static double msPerHour = SecondsPerHour * 1000.0;
static double msPerMinute = SecondsPerMinute * 1000.0;
#else
#define msPerDay        (SecondsPerDay * msPerSecond)
#define msPerHour       (SecondsPerHour * msPerSecond)
#define msPerMinute     (SecondsPerMinute * msPerSecond)
#define msPerSecond     1000.0
#endif

#define Day(t)          floor((t) / msPerDay)

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

static inline bool
IsLeapYear(int year)
{
    return year % 4 == 0 && (year % 100 || (year % 400 == 0));
}

static inline int
DaysInYear(int year)
{
    return IsLeapYear(year) ? 366 : 365;
}

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

/* math here has to be f.p, because we need
 *  floor((1968 - 1969) / 4) == -1
 */
#define DayFromYear(y)  (365 * ((y)-1970) + floor(((y)-1969)/4.0)            \
                         - floor(((y)-1901)/100.0) + floor(((y)-1601)/400.0))
#define TimeFromYear(y) (DayFromYear(y) * msPerDay)

static int
YearFromTime(double t)
{
    int y = (int) floor(t /(msPerDay*365.2425)) + 1970;
    double t2 = (double) 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;
}

#define DayWithinYear(t, year) ((int) (Day(t) - DayFromYear(year)))

/*
 * 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 double firstDayOfMonth[2][13] = {
    {0.0, 31.0, 59.0, 90.0, 120.0, 151.0, 181.0, 212.0, 243.0, 273.0, 304.0, 334.0, 365.0},
    {0.0, 31.0, 60.0, 91.0, 121.0, 152.0, 182.0, 213.0, 244.0, 274.0, 305.0, 335.0, 366.0}
};

#define DayFromMonth(m, leap) firstDayOfMonth[leap][(int)m]

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

static int
MonthFromTime(double t)
{
    int d, step;
    int year = YearFromTime(t);
    d = DayWithinYear(t, year);

    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;
}

static int
DateFromTime(double t)
{
    int d, step, next;
    int year = YearFromTime(t);
    d = DayWithinYear(t, year);

    if (d <= (next = 30))
        return d + 1;
    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;
}

static int
WeekDay(double t)
{
    int result;
    result = (int) Day(t) + 4;
    result = result % 7;
    if (result < 0)
        result += 7;
    return (int) result;
}

#define MakeTime(hour, min, sec, ms) \
((((hour) * MinutesPerHour + (min)) * SecondsPerMinute + (sec)) * msPerSecond + (ms))

static double
MakeDay(double year, double month, double date)
{
    JSBool leap;
    double yearday;
    double monthday;

    year += floor(month / 12);

    month = fmod(month, 12.0);
    if (month < 0)
        month += 12;

    leap = IsLeapYear((int) year);

    yearday = floor(TimeFromYear(year) / msPerDay);
    monthday = DayFromMonth(month, leap);

    return yearday + monthday + date - 1;
}

#define MakeDate(day, time) ((day) * msPerDay + (time))

/*
 * 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 int yearStartingWith[2][7] = {
    {1978, 1973, 1974, 1975, 1981, 1971, 1977},
    {1984, 1996, 1980, 1992, 1976, 1988, 1972}
};

/*
 * 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)
{
    int day;

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

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

/* LocalTZA gets set by js_InitDateClass() */
static double LocalTZA;

static double
DaylightSavingTA(double t, JSContext *cx)
{
    /* abort if NaN */
    if (MOZ_DOUBLE_IS_NaN(t))
        return t;

    /*
     * 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(YearFromTime(t));
        double day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
        t = MakeDate(day, TimeWithinDay(t));
    }

    int64_t timeMilliseconds = static_cast<int64_t>(t);
    int64_t offsetMilliseconds = cx->dstOffsetCache.getDSTOffsetMilliseconds(timeMilliseconds, cx);
    return static_cast<double>(offsetMilliseconds);
}

static double
AdjustTime(double date, JSContext *cx)
{
    double t = DaylightSavingTA(date, cx) + LocalTZA;
    t = (LocalTZA >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay);
    return t;
}

static double
LocalTime(double t, JSContext *cx)
{
    return t + AdjustTime(t, cx);
}

static double
UTC(double t, JSContext *cx)
{
    return t - AdjustTime(t - LocalTZA, cx);
}

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

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

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

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

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

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

    return DefaultValue(cx, RootedVarObject(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_PropertyStub,         /* 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)
{
    double day;
    double msec_time;
    double result;

    day = MakeDay(year, mon, mday);
    msec_time = MakeTime(hour, min, sec, msec);
    result = MakeDate(day, msec_time);
    return result;
}

/* 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] = js_DoubleToInteger(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, JS_MIN(limit, init+n)))
        return ((*i - init) == n);

    *i = init;
    return JS_FALSE;
}

/*
 * 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, JSContext *cx)
{
    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, cx);
    } 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, JSContext *cx)
{
    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, cx))
        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, cx);
    } 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)
{
    JSString *str;
    double result;

    if (argc == 0) {
        vp->setDouble(js_NaN);
        return true;
    }
    str = ToString(cx, vp[2]);
    if (!str)
        return JS_FALSE;
    vp[2].setString(str);
    JSLinearString *linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return false;

    if (!date_parseString(linearStr, &result, cx)) {
        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 JSBool
SetUTCTime(JSContext *cx, 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);
    return true;
}

static void
SetDateToNaN(JSContext *cx, JSObject *obj, Value *vp = NULL)
{
    double NaN = cx->runtime->NaNValue.getDoubleRef();
    SetUTCTime(cx, obj, NaN, vp);
}

/*
 * 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 bool
FillLocalTimes(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj->isDate());

    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 true;
    }

    double localTime = LocalTime(utcTime, cx);

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

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

    return true;
}

/* Cache the local times in obj, if necessary. */
static inline bool
GetAndCacheLocalTime(JSContext *cx, JSObject *obj)
{
    JS_ASSERT(obj->isDate());

    /* If the local time is undefined, we need to fill in the cached values. */
    if (obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_TIME).isUndefined()) {
        if (!FillLocalTimes(cx, obj))
            return false;
    }
    return true;
}

static inline bool
GetAndCacheLocalTime(JSContext *cx, JSObject *obj, double *time)
{
    if (!obj || !GetAndCacheLocalTime(cx, obj))
        return false;

    *time = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_TIME).toDouble();
    return true;
}

/*
 * See ECMA 15.9.5.4 thru 15.9.5.23
 */
static JSBool
date_getTime(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getTime, &DateClass, &ok);
    if (!obj)
        return ok;

    args.rval() = obj->getDateUTCTime();
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getYear, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    Value yearVal = obj->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() = yearVal;
    }

    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getFullYear, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_YEAR);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCFullYear, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = YearFromTime(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getMonth, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_MONTH);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCMonth, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = MonthFromTime(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getDate, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_DATE);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCDate, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = DateFromTime(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getDay, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_DAY);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCDay, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = WeekDay(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getHours, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_HOURS);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCHours, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = HourFromTime(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getMinutes, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_MINUTES);
    return true;
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCMinutes, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = MinFromTime(result);

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

/* Date.getSeconds is mapped to getUTCSeconds */

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCSeconds, &DateClass, &ok);
    if (!obj)
        return ok;

    if (!GetAndCacheLocalTime(cx, obj))
        return false;

    args.rval() = obj->getSlot(JSObject::JSSLOT_DATE_LOCAL_SECONDS);
    return true;
}

/* Date.getMilliseconds is mapped to getUTCMilliseconds */

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getUTCMilliseconds, &DateClass, &ok);
    if (!obj)
        return ok;

    double result = obj->getDateUTCTime().toNumber();
    if (MOZ_DOUBLE_IS_FINITE(result))
        result = msFromTime(result);

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_getTimezoneOffset, &DateClass, &ok);
    if (!obj)
        return ok;

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

    double localtime;
    if (!GetAndCacheLocalTime(cx, obj, &localtime))
        return false;

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_setTime, &DateClass, &ok);
    if (!obj)
        return ok;

    if (args.length() == 0) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

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

    return SetUTCTime(cx, obj, TIMECLIP(result), &args.rval());
}

static JSBool
date_makeTime(JSContext *cx, Native native, unsigned maxargs, JSBool local, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, native, &DateClass, &ok);
    if (!obj)
        return ok;

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

    /*
     * Satisfy the ECMA rule that if a function is called with
     * fewer arguments than the specified formal arguments, the
     * remaining arguments are set to undefined.  Seems like all
     * the Date.setWhatever functions in ECMA are only varargs
     * beyond the first argument; this should be set to undefined
     * if it's not given.  This means that "d = new Date();
     * d.setMilliseconds()" returns NaN.  Blech.
     */
    if (args.length() == 0) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

    unsigned numNums = Min(args.length(), maxargs);
    JS_ASSERT(numNums <= 4);
    double nums[4];
    bool argIsNotFinite = false;
    for (unsigned i = 0; i < numNums; i++) {
        if (!ToNumber(cx, args[i], &nums[i]))
            return false;
        if (!MOZ_DOUBLE_IS_FINITE(nums[i])) {
            argIsNotFinite = true;
        } else {
            nums[i] = js_DoubleToInteger(nums[i]);
        }
    }

    /*
     * Return NaN if the date is already NaN, but don't short-circuit argument
     * evaluation.
     */
    if (!MOZ_DOUBLE_IS_FINITE(result)) {
        args.rval().setNumber(result);
        return true;
    }

    /* set Date to NaN, after argument evaluation. */
    if (argIsNotFinite) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

    double lorutime;  /* Local or UTC version of *date */
    if (local)
        lorutime = LocalTime(result, cx);
    else
        lorutime = result;

    double *argp = nums;
    double *stop = argp + numNums;
    double hour;
    if (maxargs >= 4 && argp < stop)
        hour = *argp++;
    else
        hour = HourFromTime(lorutime);

    double min;
    if (maxargs >= 3 && argp < stop)
        min = *argp++;
    else
        min = MinFromTime(lorutime);

    double sec;
    if (maxargs >= 2 && argp < stop)
        sec = *argp++;
    else
        sec = SecFromTime(lorutime);

    double msec;
    if (maxargs >= 1 && argp < stop)
        msec = *argp;
    else
        msec = msFromTime(lorutime);

    double msec_time = MakeTime(hour, min, sec, msec);
    result = MakeDate(Day(lorutime), msec_time);

    if (local)
        result = UTC(result, cx);

    return SetUTCTime(cx, obj, TIMECLIP(result), &args.rval());
}

static JSBool
date_setMilliseconds(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setMilliseconds, 1, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCMilliseconds(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setUTCMilliseconds, 1, JS_FALSE, argc, vp);
}

static JSBool
date_setSeconds(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setSeconds, 2, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCSeconds(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setUTCSeconds, 2, JS_FALSE, argc, vp);
}

static JSBool
date_setMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setMinutes, 3, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCMinutes(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setUTCMinutes, 3, JS_FALSE, argc, vp);
}

static JSBool
date_setHours(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setHours, 4, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCHours(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeTime(cx, date_setUTCHours, 4, JS_FALSE, argc, vp);
}

static JSBool
date_makeDate(JSContext *cx, Native native, unsigned maxargs, JSBool local, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, native, &DateClass, &ok);
    if (!obj)
        return ok;

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

    /* See complaint about ECMA in date_makeTime. */
    if (args.length() == 0) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

    unsigned numNums = Min(args.length(), maxargs);
    JS_ASSERT(1 <= numNums && numNums <= 3);
    double nums[3];
    bool argIsNotFinite = false;
    for (unsigned i = 0; i < numNums; i++) {
        if (!ToNumber(cx, args[i], &nums[i]))
            return JS_FALSE;
        if (!MOZ_DOUBLE_IS_FINITE(nums[i])) {
            argIsNotFinite = true;
        } else {
            nums[i] = js_DoubleToInteger(nums[i]);
        }
    }

    /* If we found a non-finite argument, set the date to NaN and return. */
    if (argIsNotFinite) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

    /*
     * Return NaN if date is NaN and we're not setting the year.  If we are,
     * use 0 as the time.
     */
    double lorutime; /* local or UTC version of *date */
    if (!MOZ_DOUBLE_IS_FINITE(result)) {
        if (maxargs < 3) {
            args.rval().setDouble(result);
            return true;
        }
        lorutime = +0.;
    } else {
        lorutime = local ? LocalTime(result, cx) : result;
    }

    double *argp = nums;
    double *stop = argp + numNums;
    double year;
    if (maxargs >= 3 && argp < stop)
        year = *argp++;
    else
        year = YearFromTime(lorutime);

    double month;
    if (maxargs >= 2 && argp < stop)
        month = *argp++;
    else
        month = MonthFromTime(lorutime);

    double day;
    if (maxargs >= 1 && argp < stop)
        day = *argp++;
    else
        day = DateFromTime(lorutime);

    day = MakeDay(year, month, day); /* day within year */
    result = MakeDate(day, TimeWithinDay(lorutime));

    if (local)
        result = UTC(result, cx);

    return SetUTCTime(cx, obj, TIMECLIP(result), &args.rval());
}

static JSBool
date_setDate(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setDate, 1, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCDate(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setUTCDate, 1, JS_FALSE, argc, vp);
}

static JSBool
date_setMonth(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setMonth, 2, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCMonth(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setUTCMonth, 2, JS_FALSE, argc, vp);
}

static JSBool
date_setFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setFullYear, 3, JS_TRUE, argc, vp);
}

static JSBool
date_setUTCFullYear(JSContext *cx, unsigned argc, Value *vp)
{
    return date_makeDate(cx, date_setUTCFullYear, 3, JS_FALSE, argc, vp);
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_setYear, &DateClass, &ok);
    if (!obj)
        return ok;

    if (args.length() == 0) {
        /* Call this only after verifying that obj.[[Class]] = "Date". */
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }

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

    double year;
    if (!ToNumber(cx, args[0], &year))
        return false;
    if (!MOZ_DOUBLE_IS_FINITE(year)) {
        SetDateToNaN(cx, obj, &args.rval());
        return true;
    }
    year = js_DoubleToInteger(year);
    if (year >= 0 && year <= 99)
        year += 1900;

    double t = MOZ_DOUBLE_IS_FINITE(result) ? LocalTime(result, cx) : +0.0;
    double day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
    result = MakeDate(day, TimeWithinDay(t));
    result = UTC(result, cx);

    return SetUTCTime(cx, obj, TIMECLIP(result), &args.rval());
}

/* 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_snprintf(buf, size, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
                days[WeekDay(utctime)],
                DateFromTime(utctime),
                months[MonthFromTime(utctime)],
                YearFromTime(utctime),
                HourFromTime(utctime),
                MinFromTime(utctime),
                SecFromTime(utctime));
}

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

static JSBool
date_utc_format(JSContext *cx, Native native, CallArgs args,
                void (*printFunc)(char*, size_t, double))
{
    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, native, &DateClass, &ok);
    if (!obj)
        return ok;

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

    char buf[100];
    if (!MOZ_DOUBLE_IS_FINITE(utctime)) {
        if (printFunc == print_iso_string) {
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INVALID_DATE);
            return false;
        }

        JS_snprintf(buf, sizeof buf, js_NaN_date_str);
    } else {
        (*printFunc)(buf, sizeof buf, utctime);
    }

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

static JSBool
date_toGMTString(JSContext *cx, unsigned argc, Value *vp)
{
    return date_utc_format(cx, date_toGMTString, CallArgsFromVp(argc, vp), print_gmt_string);
}

static JSBool
date_toISOString(JSContext *cx, unsigned argc, Value *vp)
{
    return date_utc_format(cx, date_toISOString, CallArgsFromVp(argc, vp), print_iso_string);
}

/* ES5 15.9.5.44. */
static JSBool
date_toJSON(JSContext *cx, unsigned argc, Value *vp)
{
    /* Step 1. */
    JSObject *obj = ToObject(cx, &vp[1]);
    if (!obj)
        return false;

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

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

    /* Step 4. */
    Value &toISO = vp[0];
    if (!obj->getProperty(cx, cx->runtime->atomState.toISOStringAtom, &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 args;
    if (!cx->stack.pushInvokeArgs(cx, 0, &args))
        return false;

    args.calleev() = toISO;
    args.thisv().setObject(*obj);

    if (!Invoke(cx, args))
        return false;
    *vp = args.rval();
    return true;
}

/* for Date.toLocaleString; interface to PRMJTime date struct.
 */
static void
new_explode(double timeval, PRMJTime *split, JSContext *cx)
{
    int 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, cx) != 0);
}

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

/* helper function */
static JSBool
date_format(JSContext *cx, double date, formatspec format, CallReceiver call)
{
    char buf[100];
    JSString *str;
    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 {
        double local = LocalTime(date, cx);

        /* offset from GMT in minutes.  The offset includes daylight savings,
           if it applies. */
        int minutes = (int) floor(AdjustTime(date, cx) / 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);
        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[WeekDay(local)],
                        months[MonthFromTime(local)],
                        DateFromTime(local),
                        YearFromTime(local),
                        HourFromTime(local),
                        MinFromTime(local),
                        SecFromTime(local),
                        offset,
                        usetz ? " " : "",
                        usetz ? tzbuf : "");
            break;
          case FORMATSPEC_DATE:
            /* Tue Oct 31 2000 */
            JS_snprintf(buf, sizeof buf,
                        "%s %s %.2d %.4d",
                        days[WeekDay(local)],
                        months[MonthFromTime(local)],
                        DateFromTime(local),
                        YearFromTime(local));
            break;
          case FORMATSPEC_TIME:
            /* 09:41:40 GMT-0800 (PST) */
            JS_snprintf(buf, sizeof buf,
                        "%.2d:%.2d:%.2d GMT%+.4d%s%s",
                        HourFromTime(local),
                        MinFromTime(local),
                        SecFromTime(local),
                        offset,
                        usetz ? " " : "",
                        usetz ? tzbuf : "");
            break;
        }
    }

    str = JS_NewStringCopyZ(cx, buf);
    if (!str)
        return JS_FALSE;
    call.rval().setString(str);
    return JS_TRUE;
}

static bool
ToLocaleHelper(JSContext *cx, CallReceiver call, JSObject *obj, const char *format)
{
    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);
        PRMJTime split;
        new_explode(local, &split, cx);

        /* 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, call);

        /* 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->localeCallbacks && cx->localeCallbacks->localeToUnicode)
        return cx->localeCallbacks->localeToUnicode(cx, buf, &call.rval());

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

/*
 * NB: Because of NonGenericMethodGuard, the calling native return immediately
 * after calling date_toLocaleHelper, even if it returns 'true'.
 */
static JSBool
date_toLocaleHelper(JSContext *cx, unsigned argc, Value *vp, Native native, const char *format)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, native, &DateClass, &ok);
    if (!obj)
        return ok;

    return ToLocaleHelper(cx, args, obj, format);
}

static JSBool
date_toLocaleStringHelper(JSContext *cx, Native native, unsigned argc, Value *vp)
{
    /*
     * 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 date_toLocaleHelper(cx, argc, vp, native,
#if defined(_WIN32) && !defined(__MWERKS__)
                                   "%#c"
#else
                                   "%c"
#endif
                               );
}

static JSBool
date_toLocaleString(JSContext *cx, unsigned argc, Value *vp)
{
    return date_toLocaleStringHelper(cx, date_toLocaleString, argc, vp);
}

static JSBool
date_toLocaleDateString(JSContext *cx, unsigned argc, Value *vp)
{
    /*
     * 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.
     */
    return date_toLocaleHelper(cx, argc, vp, date_toLocaleDateString,
#if defined(_WIN32) && !defined(__MWERKS__)
                                   "%#x"
#else
                                   "%x"
#endif
                               );
}

static JSBool
date_toLocaleTimeString(JSContext *cx, unsigned argc, Value *vp)
{
    return date_toLocaleHelper(cx, argc, vp, date_toLocaleTimeString, "%X");
}

static JSBool
date_toLocaleFormat(JSContext *cx, unsigned argc, Value *vp)
{
    if (argc == 0)
        return date_toLocaleStringHelper(cx, date_toLocaleFormat, argc, vp);

    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_toLocaleFormat, &DateClass, &ok);
    if (!obj)
        return ok;

    JSString *fmt = ToString(cx, args[0]);
    if (!fmt)
        return false;

    args[0].setString(fmt);
    JSAutoByteString fmtbytes(cx, fmt);
    if (!fmtbytes)
        return false;

    return ToLocaleHelper(cx, args, obj, fmtbytes.ptr());
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_toTimeString, &DateClass, &ok);
    if (!obj)
        return ok;

    return date_format(cx, obj->getDateUTCTime().toNumber(), FORMATSPEC_TIME, args);
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_toDateString, &DateClass, &ok);
    if (!obj)
        return ok;

    return date_format(cx, obj->getDateUTCTime().toNumber(), FORMATSPEC_DATE, args);
}

#if JS_HAS_TOSOURCE
static JSBool
date_toSource(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_toSource, &DateClass, &ok);
    if (!obj)
        return ok;

    StringBuffer sb(cx);
    if (!sb.append("(new Date(") || !NumberValueToStringBuffer(cx, obj->getDateUTCTime(), sb) ||
        !sb.append("))"))
    {
        return false;
    }

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

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_toString, &DateClass, &ok);
    if (!obj)
        return ok;

    return date_format(cx, obj->getDateUTCTime().toNumber(), FORMATSPEC_FULL, args);
}

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

    bool ok;
    JSObject *obj = NonGenericMethodGuard(cx, args, date_valueOf, &DateClass, &ok);
    if (!obj)
        return ok;

    /* If called directly with no arguments, convert to a time number. */
    if (argc == 0) {
        args.rval() = obj->getDateUTCTime();
        return true;
    }

    /* Convert to number only if the hint was given, otherwise favor string. */
    JSString *str = ToString(cx, args[0]);
    if (!str)
        return false;
    JSLinearString *linear_str = str->ensureLinear(cx);
    if (!linear_str)
        return false;
    JSAtom *number_str = cx->runtime->atomState.typeAtoms[JSTYPE_NUMBER];
    if (EqualStrings(linear_str, number_str)) {
        args.rval() = obj->getDateUTCTime();
        return true;
    }
    return date_format(cx, obj->getDateUTCTime().toNumber(), FORMATSPEC_FULL, args);
}

static 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 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(js_toLocaleString_str, date_toLocaleString,     0,0),
    JS_FN("toLocaleDateString",  date_toLocaleDateString, 0,0),
    JS_FN("toLocaleTimeString",  date_toLocaleTimeString, 0,0),
    JS_FN("toLocaleFormat",      date_toLocaleFormat,     0,0),
    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);

    /* Date called as constructor. */
    double d;
    if (args.length() == 0) {
        d = NowAsMillis();
    } else if (args.length() == 1) {
        if (!args[0].isString()) {
            /* the argument is a millisecond number */
            if (!ToNumber(cx, args[0], &d))
                return false;
            d = TIMECLIP(d);
        } else {
            /* the argument is a string; parse it. */
            JSString *str = ToString(cx, args[0]);
            if (!str)
                return false;
            args[0].setString(str);
            JSLinearString *linearStr = str->ensureLinear(cx);
            if (!linearStr)
                return false;

            if (!date_parseString(linearStr, &d, cx))
                d = js_NaN;
            else
                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);
            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, JSObject *obj)
{
    JS_ASSERT(obj->isNative());

    /* Set the static LocalTZA. */
    LocalTZA = -(PRMJ_LocalGMTDifference() * msPerSecond);

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

    RootedVarObject dateProto(cx, global->createBlankPrototype(cx, &DateClass));
    if (!dateProto)
        return NULL;
    SetDateToNaN(cx, dateProto);

    RootedVarFunction ctor(cx);
    ctor = global->createConstructor(cx, js_Date, CLASS_ATOM(cx, 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;
    Value toUTCStringFun;
    jsid toUTCStringId = ATOM_TO_JSID(cx->runtime->atomState.toUTCStringAtom);
    jsid toGMTStringId = ATOM_TO_JSID(cx->runtime->atomState.toGMTStringAtom);
    if (!js_GetProperty(cx, dateProto, toUTCStringId, &toUTCStringFun) ||
        !js_DefineProperty(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;
    if (!SetUTCTime(cx, obj, msec_time))
        return NULL;
    return obj;
}

JS_FRIEND_API(JSObject *)
js_NewDateObject(JSContext* cx, int year, int mon, int mday,
                 int hour, int min, int sec)
{
    JSObject *obj;
    double msec_time;

    JS_ASSERT(mon < 12);
    msec_time = date_msecFromDate(year, mon, mday, hour, min, sec, 0);
    obj = js_NewDateObjectMsec(cx, UTC(msec_time, cx));
    return obj;
}

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

JS_FRIEND_API(int)
js_DateGetYear(JSContext *cx, JSObject* obj)
{
    double localtime;

    /* Preserve legacy API behavior of returning 0 for invalid dates. */
    if (!GetAndCacheLocalTime(cx, obj, &localtime) || MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) YearFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetMonth(JSContext *cx, JSObject* obj)
{
    double localtime;

    if (!GetAndCacheLocalTime(cx, obj, &localtime) || MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) MonthFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetDate(JSContext *cx, JSObject* obj)
{
    double localtime;

    if (!GetAndCacheLocalTime(cx, obj, &localtime) || MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) DateFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetHours(JSContext *cx, JSObject* obj)
{
    double localtime;

    if (!GetAndCacheLocalTime(cx, obj, &localtime) || MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) HourFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetMinutes(JSContext *cx, JSObject* obj)
{
    double localtime;

    if (!GetAndCacheLocalTime(cx, obj, &localtime) || MOZ_DOUBLE_IS_NaN(localtime))
        return 0;

    return (int) MinFromTime(localtime);
}

JS_FRIEND_API(int)
js_DateGetSeconds(JSContext *cx, 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(JSContext *cx, JSObject *obj)
{
    return obj->isDate() ? obj->getDateUTCTime().toNumber() : 0;
}

#ifdef JS_THREADSAFE
#include "prinrval.h"

JS_FRIEND_API(uint32_t)
js_IntervalNow()
{
    return uint32_t(PR_IntervalToMilliseconds(PR_IntervalNow()));
}

#else /* !JS_THREADSAFE */

JS_FRIEND_API(uint32_t)
js_IntervalNow()
{
    return uint32_t(PRMJ_Now() / PRMJ_USEC_PER_MSEC);
}
#endif