443 lines
16 KiB
C#
443 lines
16 KiB
C#
// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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namespace System.Globalization {
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using System;
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using System.Diagnostics.Contracts;
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//
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// This class implements the Julian calendar. In 48 B.C. Julius Caesar ordered a calendar reform, and this calendar
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// is called Julian calendar. It consisted of a solar year of twelve months and of 365 days with an extra day
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// every fourth year.
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//*
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//* Calendar support range:
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//* Calendar Minimum Maximum
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//* ========== ========== ==========
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//* Gregorian 0001/01/01 9999/12/31
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//* Julia 0001/01/03 9999/10/19
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[Serializable]
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[System.Runtime.InteropServices.ComVisible(true)]
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public class JulianCalendar : Calendar {
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public static readonly int JulianEra = 1;
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private const int DatePartYear = 0;
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private const int DatePartDayOfYear = 1;
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private const int DatePartMonth = 2;
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private const int DatePartDay = 3;
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// Number of days in a non-leap year
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private const int JulianDaysPerYear = 365;
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// Number of days in 4 years
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private const int JulianDaysPer4Years = JulianDaysPerYear * 4 + 1;
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//internal static Calendar m_defaultInstance;
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private static readonly int[] DaysToMonth365 =
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{
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
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};
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private static readonly int[] DaysToMonth366 =
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{
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0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366
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};
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// Gregorian Calendar 9999/12/31 = Julian Calendar 9999/10/19
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// keep it as variable field for serialization compat.
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internal int MaxYear = 9999;
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[System.Runtime.InteropServices.ComVisible(false)]
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public override DateTime MinSupportedDateTime
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{
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get
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{
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return (DateTime.MinValue);
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}
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}
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[System.Runtime.InteropServices.ComVisible(false)]
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public override DateTime MaxSupportedDateTime
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{
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get
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{
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return (DateTime.MaxValue);
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}
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}
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// Return the type of the Julian calendar.
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//
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[System.Runtime.InteropServices.ComVisible(false)]
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public override CalendarAlgorithmType AlgorithmType
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{
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get
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{
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return CalendarAlgorithmType.SolarCalendar;
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}
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}
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/*=================================GetDefaultInstance==========================
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**Action: Internal method to provide a default intance of JulianCalendar. Used by NLS+ implementation
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** and other calendars.
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**Returns:
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**Arguments:
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**Exceptions:
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============================================================================*/
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/*
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internal static Calendar GetDefaultInstance() {
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if (m_defaultInstance == null) {
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m_defaultInstance = new JulianCalendar();
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}
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return (m_defaultInstance);
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}
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*/
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// Construct an instance of gregorian calendar.
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public JulianCalendar() {
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// There is no system setting of TwoDigitYear max, so set the value here.
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twoDigitYearMax = 2029;
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}
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internal override int ID {
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get {
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return (CAL_JULIAN);
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}
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}
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static internal void CheckEraRange(int era) {
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if (era != CurrentEra && era != JulianEra) {
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throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
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}
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}
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internal void CheckYearEraRange(int year, int era) {
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CheckEraRange(era);
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if (year <= 0 || year > MaxYear) {
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throw new ArgumentOutOfRangeException(
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"year",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Range"),
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1,
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MaxYear));
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}
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}
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static internal void CheckMonthRange(int month) {
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if (month < 1 || month > 12) {
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throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
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}
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}
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/*=================================GetDefaultInstance==========================
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**Action: Check for if the day value is valid.
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**Returns:
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**Arguments:
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**Exceptions:
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**Notes:
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** Before calling this method, call CheckYearEraRange()/CheckMonthRange() to make
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** sure year/month values are correct.
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============================================================================*/
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static internal void CheckDayRange(int year, int month, int day) {
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if (year == 1 && month == 1)
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{
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// The mimimum supported Julia date is Julian 0001/01/03.
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if (day < 3) {
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throw new ArgumentOutOfRangeException(null,
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Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
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}
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}
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bool isLeapYear = (year % 4) == 0;
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int[] days = isLeapYear ? DaysToMonth366 : DaysToMonth365;
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int monthDays = days[month] - days[month - 1];
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if (day < 1 || day > monthDays) {
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throw new ArgumentOutOfRangeException(
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"day",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Range"),
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1,
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monthDays));
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}
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}
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// Returns a given date part of this DateTime. This method is used
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// to compute the year, day-of-year, month, or day part.
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static internal int GetDatePart(long ticks, int part)
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{
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// Gregorian 1/1/0001 is Julian 1/3/0001. Remember DateTime(0) is refered to Gregorian 1/1/0001.
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// The following line convert Gregorian ticks to Julian ticks.
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long julianTicks = ticks + TicksPerDay * 2;
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// n = number of days since 1/1/0001
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int n = (int)(julianTicks / TicksPerDay);
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// y4 = number of whole 4-year periods within 100-year period
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int y4 = n / JulianDaysPer4Years;
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// n = day number within 4-year period
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n -= y4 * JulianDaysPer4Years;
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// y1 = number of whole years within 4-year period
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int y1 = n / JulianDaysPerYear;
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// Last year has an extra day, so decrement result if 4
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if (y1 == 4) y1 = 3;
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// If year was requested, compute and return it
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if (part == DatePartYear)
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{
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return (y4 * 4 + y1 + 1);
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}
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// n = day number within year
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n -= y1 * JulianDaysPerYear;
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// If day-of-year was requested, return it
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if (part == DatePartDayOfYear)
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{
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return (n + 1);
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}
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// Leap year calculation looks different from IsLeapYear since y1, y4,
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// and y100 are relative to year 1, not year 0
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bool leapYear = (y1 == 3);
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int[] days = leapYear? DaysToMonth366: DaysToMonth365;
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// All months have less than 32 days, so n >> 5 is a good conservative
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// estimate for the month
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int m = n >> 5 + 1;
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// m = 1-based month number
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while (n >= days[m]) m++;
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// If month was requested, return it
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if (part == DatePartMonth) return (m);
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// Return 1-based day-of-month
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return (n - days[m - 1] + 1);
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}
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// Returns the tick count corresponding to the given year, month, and day.
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static internal long DateToTicks(int year, int month, int day)
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{
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int[] days = (year % 4 == 0)? DaysToMonth366: DaysToMonth365;
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int y = year - 1;
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int n = y * 365 + y / 4 + days[month - 1] + day - 1;
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// Gregorian 1/1/0001 is Julian 1/3/0001. n * TicksPerDay is the ticks in JulianCalendar.
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// Therefore, we subtract two days in the following to convert the ticks in JulianCalendar
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// to ticks in Gregorian calendar.
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return ((n - 2) * TicksPerDay);
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}
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public override DateTime AddMonths(DateTime time, int months)
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{
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if (months < -120000 || months > 120000) {
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throw new ArgumentOutOfRangeException(
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"months",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Range"),
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-120000,
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120000));
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}
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Contract.EndContractBlock();
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int y = GetDatePart(time.Ticks, DatePartYear);
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int m = GetDatePart(time.Ticks, DatePartMonth);
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int d = GetDatePart(time.Ticks, DatePartDay);
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int i = m - 1 + months;
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if (i >= 0) {
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m = i % 12 + 1;
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y = y + i / 12;
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}
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else {
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m = 12 + (i + 1) % 12;
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y = y + (i - 11) / 12;
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}
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int[] daysArray = (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0)) ? DaysToMonth366: DaysToMonth365;
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int days = (daysArray[m] - daysArray[m - 1]);
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if (d > days) {
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d = days;
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}
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long ticks = DateToTicks(y, m, d) + time.Ticks % TicksPerDay;
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Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime);
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return (new DateTime(ticks));
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}
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public override DateTime AddYears(DateTime time, int years) {
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return (AddMonths(time, years * 12));
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}
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public override int GetDayOfMonth(DateTime time) {
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return (GetDatePart(time.Ticks, DatePartDay));
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}
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public override DayOfWeek GetDayOfWeek(DateTime time) {
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return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7));
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}
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public override int GetDayOfYear(DateTime time) {
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return (GetDatePart(time.Ticks, DatePartDayOfYear));
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}
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public override int GetDaysInMonth(int year, int month, int era) {
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CheckYearEraRange(year, era);
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CheckMonthRange(month);
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int[] days = (year % 4 == 0) ? DaysToMonth366: DaysToMonth365;
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return (days[month] - days[month - 1]);
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}
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public override int GetDaysInYear(int year, int era) {
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// Year/Era range is done in IsLeapYear().
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return (IsLeapYear(year, era) ? 366:365);
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}
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public override int GetEra(DateTime time)
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{
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return (JulianEra);
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}
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public override int GetMonth(DateTime time)
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{
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return (GetDatePart(time.Ticks, DatePartMonth));
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}
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public override int[] Eras {
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get {
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return (new int[] {JulianEra});
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}
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}
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public override int GetMonthsInYear(int year, int era)
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{
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CheckYearEraRange(year, era);
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return (12);
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}
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public override int GetYear(DateTime time)
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{
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return (GetDatePart(time.Ticks, DatePartYear));
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}
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public override bool IsLeapDay(int year, int month, int day, int era)
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{
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CheckMonthRange(month);
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// Year/Era range check is done in IsLeapYear().
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if (IsLeapYear(year, era)) {
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CheckDayRange(year, month, day);
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return (month == 2 && day == 29);
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}
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CheckDayRange(year, month, day);
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return (false);
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}
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// Returns the leap month in a calendar year of the specified era. This method returns 0
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// if this calendar does not have leap month, or this year is not a leap year.
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//
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[System.Runtime.InteropServices.ComVisible(false)]
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public override int GetLeapMonth(int year, int era)
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{
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CheckYearEraRange(year, era);
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return (0);
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}
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public override bool IsLeapMonth(int year, int month, int era)
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{
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CheckYearEraRange(year, era);
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CheckMonthRange(month);
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return (false);
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}
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// Checks whether a given year in the specified era is a leap year. This method returns true if
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// year is a leap year, or false if not.
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//
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public override bool IsLeapYear(int year, int era)
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{
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CheckYearEraRange(year, era);
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return (year % 4 == 0);
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}
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public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era)
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{
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CheckYearEraRange(year, era);
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CheckMonthRange(month);
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CheckDayRange(year, month, day);
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if (millisecond < 0 || millisecond >= MillisPerSecond) {
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throw new ArgumentOutOfRangeException(
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"millisecond",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Range"),
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0,
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MillisPerSecond - 1));
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}
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if (hour >= 0 && hour < 24 && minute >= 0 && minute < 60 && second >=0 && second < 60)
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{
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return new DateTime(DateToTicks(year, month, day) + (new TimeSpan(0, hour, minute, second, millisecond)).Ticks);
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} else
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{
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throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadHourMinuteSecond"));
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}
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}
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public override int TwoDigitYearMax {
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get {
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return (twoDigitYearMax);
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}
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set {
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VerifyWritable();
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if (value < 99 || value > MaxYear)
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{
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throw new ArgumentOutOfRangeException(
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"year",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Range"),
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99,
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MaxYear));
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}
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twoDigitYearMax = value;
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}
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}
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public override int ToFourDigitYear(int year) {
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if (year < 0) {
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throw new ArgumentOutOfRangeException("year",
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Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
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}
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Contract.EndContractBlock();
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if (year > MaxYear) {
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throw new ArgumentOutOfRangeException(
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"year",
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String.Format(
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CultureInfo.CurrentCulture,
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Environment.GetResourceString("ArgumentOutOfRange_Bounds_Lower_Upper"),
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1,
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MaxYear));
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}
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return (base.ToFourDigitYear(year));
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}
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}
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}
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