759 lines
30 KiB
C#
759 lines
30 KiB
C#
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// ==++==
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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.Runtime.Versioning;
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using System.Diagnostics.Contracts;
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#if !FEATURE_WIN32_REGISTRY
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using System.Text;
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using Microsoft.Win32;
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#endif // FEATURE_PAL
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////////////////////////////////////////////////////////////////////////////
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//
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// Rules for the Hijri calendar:
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// - The Hijri calendar is a strictly Lunar calendar.
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// - Days begin at sunset.
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// - Islamic Year 1 (Muharram 1, 1 A.H.) is equivalent to absolute date
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// 227015 (Friday, July 16, 622 C.E. - Julian).
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// - Leap Years occur in the 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, & 29th
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// years of a 30-year cycle. Year = leap iff ((11y+14) mod 30 < 11).
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// - There are 12 months which contain alternately 30 and 29 days.
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// - The 12th month, Dhu al-Hijjah, contains 30 days instead of 29 days
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// in a leap year.
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// - Common years have 354 days. Leap years have 355 days.
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// - There are 10,631 days in a 30-year cycle.
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// - The Islamic months are:
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// 1. Muharram (30 days) 7. Rajab (30 days)
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// 2. Safar (29 days) 8. Sha'ban (29 days)
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// 3. Rabi I (30 days) 9. Ramadan (30 days)
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// 4. Rabi II (29 days) 10. Shawwal (29 days)
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// 5. Jumada I (30 days) 11. Dhu al-Qada (30 days)
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// 6. Jumada II (29 days) 12. Dhu al-Hijjah (29 days) {30}
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//
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// NOTENOTE
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// The calculation of the HijriCalendar is based on the absolute date. And the
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// absolute date means the number of days from January 1st, 1 A.D.
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// Therefore, we do not support the days before the January 1st, 1 A.D.
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//
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////////////////////////////////////////////////////////////////////////////
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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 0622/07/18 9999/12/31
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** Hijri 0001/01/01 9666/04/03
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*/
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[Serializable]
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[System.Runtime.InteropServices.ComVisible(true)]
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public class HijriCalendar : Calendar {
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public static readonly int HijriEra = 1;
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internal const int DatePartYear = 0;
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internal const int DatePartDayOfYear = 1;
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internal const int DatePartMonth = 2;
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internal const int DatePartDay = 3;
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internal const int MinAdvancedHijri = -2;
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internal const int MaxAdvancedHijri = 2;
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internal static readonly int[] HijriMonthDays = {0,30,59,89,118,148,177,207,236,266,295,325,355};
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//internal static Calendar m_defaultInstance;
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#if FEATURE_WIN32_REGISTRY
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private const String InternationalRegKey = "Control Panel\\International";
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#endif // FEATURE_WIN32_REGISTRY
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#if FEATURE_WIN32_REGISTRY || FEATURE_PAL
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private const String HijriAdvanceRegKeyEntry = "AddHijriDate";
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#endif
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private int m_HijriAdvance = Int32.MinValue;
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// DateTime.MaxValue = Hijri calendar (year:9666, month: 4, day: 3).
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internal const int MaxCalendarYear = 9666;
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internal const int MaxCalendarMonth = 4;
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internal const int MaxCalendarDay = 3;
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// Hijri calendar (year: 1, month: 1, day:1 ) = Gregorian (year: 622, month: 7, day: 18)
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// This is the minimal Gregorian date that we support in the HijriCalendar.
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internal static readonly DateTime calendarMinValue = new DateTime(622, 7, 18);
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internal static readonly DateTime calendarMaxValue = DateTime.MaxValue;
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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 (calendarMinValue);
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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 (calendarMaxValue);
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}
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}
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// Return the type of the Hijri 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.LunarCalendar;
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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 HijriCalendar. 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 HijriCalendar();
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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 Hijri calendar.
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public HijriCalendar() {
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}
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internal override int ID {
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get {
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return (CAL_HIJRI);
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}
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}
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protected override int DaysInYearBeforeMinSupportedYear
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{
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get
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{
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// the year before the 1st year of the cycle would have been the 30th year
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// of the previous cycle which is not a leap year. Common years have 354 days.
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return 354;
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}
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}
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/*=================================GetAbsoluteDateHijri==========================
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**Action: Gets the Absolute date for the given Hijri date. The absolute date means
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** the number of days from January 1st, 1 A.D.
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**Returns:
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**Arguments:
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**Exceptions:
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============================================================================*/
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long GetAbsoluteDateHijri(int y, int m, int d) {
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return (long)(DaysUpToHijriYear(y) + HijriMonthDays[m-1] + d - 1 - HijriAdjustment);
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}
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/*=================================DaysUpToHijriYear==========================
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**Action: Gets the total number of days (absolute date) up to the given Hijri Year.
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** The absolute date means the number of days from January 1st, 1 A.D.
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**Returns: Gets the total number of days (absolute date) up to the given Hijri Year.
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**Arguments: HijriYear year value in Hijri calendar.
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**Exceptions: None
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**Notes:
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============================================================================*/
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long DaysUpToHijriYear(int HijriYear) {
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long NumDays; // number of absolute days
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int NumYear30; // number of years up to current 30 year cycle
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int NumYearsLeft; // number of years into 30 year cycle
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//
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// Compute the number of years up to the current 30 year cycle.
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//
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NumYear30 = ((HijriYear - 1) / 30) * 30;
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//
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// Compute the number of years left. This is the number of years
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// into the 30 year cycle for the given year.
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//
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NumYearsLeft = HijriYear - NumYear30 - 1;
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//
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// Compute the number of absolute days up to the given year.
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//
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NumDays = ((NumYear30 * 10631L) / 30L) + 227013L;
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while (NumYearsLeft > 0) {
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// Common year is 354 days, and leap year is 355 days.
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NumDays += 354 + (IsLeapYear(NumYearsLeft, CurrentEra) ? 1: 0);
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NumYearsLeft--;
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}
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//
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// Return the number of absolute days.
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//
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return (NumDays);
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}
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public int HijriAdjustment {
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[System.Security.SecuritySafeCritical] // auto-generated
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get {
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if (m_HijriAdvance == Int32.MinValue) {
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// Never been set before. Use the system value from registry.
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m_HijriAdvance = GetAdvanceHijriDate();
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}
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return (m_HijriAdvance);
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}
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set {
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// NOTE: Check the value of Min/MaxAdavncedHijri with Arabic speakers to see if the assumption is good.
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if (value < MinAdvancedHijri || value > MaxAdvancedHijri) {
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throw new ArgumentOutOfRangeException(
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"HijriAdjustment",
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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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MinAdvancedHijri,
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MaxAdvancedHijri));
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}
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Contract.EndContractBlock();
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VerifyWritable();
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m_HijriAdvance = value;
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}
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}
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/*=================================GetAdvanceHijriDate==========================
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**Action: Gets the AddHijriDate value from the registry.
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**Returns:
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**Arguments: None.
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**Exceptions:
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**Note:
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** The HijriCalendar has a user-overidable calculation. That is, use can set a value from the control
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** panel, so that the calculation of the Hijri Calendar can move ahead or backwards from -2 to +2 days.
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**
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** The valid string values in the registry are:
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** "AddHijriDate-2" => Add -2 days to the current calculated Hijri date.
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** "AddHijriDate" => Add -1 day to the current calculated Hijri date.
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** "" => Add 0 day to the current calculated Hijri date.
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** "AddHijriDate+1" => Add +1 days to the current calculated Hijri date.
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** "AddHijriDate+2" => Add +2 days to the current calculated Hijri date.
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============================================================================*/
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[System.Security.SecurityCritical] // auto-generated
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[ResourceExposure(ResourceScope.None)]
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[ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
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static int GetAdvanceHijriDate() {
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#if FEATURE_WIN32_REGISTRY
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int hijriAdvance = 0;
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Microsoft.Win32.RegistryKey key = null;
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try {
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// Open in read-only mode.
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// Use InternalOpenSubKey so that we avoid the security check.
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key = Microsoft.Win32.Registry.CurrentUser.InternalOpenSubKey(InternationalRegKey, false);
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}
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//If this fails for any reason, we'll just return 0.
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catch (ObjectDisposedException) { return 0; }
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catch (ArgumentException) { return 0; }
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if (key != null) {
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try {
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Object value = key.InternalGetValue(HijriAdvanceRegKeyEntry, null, false, false);
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if (value == null) {
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return (0);
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}
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String str = value.ToString();
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if (String.Compare(str, 0, HijriAdvanceRegKeyEntry, 0, HijriAdvanceRegKeyEntry.Length, StringComparison.OrdinalIgnoreCase) == 0) {
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if (str.Length == HijriAdvanceRegKeyEntry.Length)
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hijriAdvance = -1;
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else {
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str = str.Substring(HijriAdvanceRegKeyEntry.Length);
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try {
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int advance = Int32.Parse(str.ToString(), CultureInfo.InvariantCulture);
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if ((advance >= MinAdvancedHijri) && (advance <= MaxAdvancedHijri)) {
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hijriAdvance = advance;
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}
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}
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// If we got garbage from registry just ignore it.
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// hijriAdvance = 0 because of declaraction assignment up above.
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catch (ArgumentException) { }
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catch (FormatException) { }
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catch (OverflowException) { }
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}
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}
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}
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finally {
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key.Close();
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}
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}
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return (hijriAdvance);
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#else //FEATURE_WIN32_REGISTRY
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int hijriAdvance = 0;
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#if FEATURE_PAL && !(FEATURE_CORECLR || MONO)
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const int parameterValueLength = 255;
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StringBuilder parameterValue = new StringBuilder(parameterValueLength);
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bool rc = Win32Native.FetchConfigurationString(true, HijriAdvanceRegKeyEntry, parameterValue, parameterValueLength);
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if( rc )
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{
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String str = parameterValue.ToString();
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if (String.Compare(str, 0, HijriAdvanceRegKeyEntry, 0, HijriAdvanceRegKeyEntry.Length, true, CultureInfo.InvariantCulture) == 0) {
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if (str.Length == HijriAdvanceRegKeyEntry.Length)
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hijriAdvance = -1;
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else {
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str = str.Substring(HijriAdvanceRegKeyEntry.Length);
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try {
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int advance = Int32.Parse(str.ToString(), CultureInfo.InvariantCulture);
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if ((advance >= MinAdvancedHijri) && (advance <= MaxAdvancedHijri)) {
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hijriAdvance = advance;
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}
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}
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// If we got garbage from registry just ignore it.
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// hijriAdvance = 0 because of declaraction assignment up above.
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catch (ArgumentException) { }
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catch (FormatException) { }
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catch (OverflowException) { }
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}
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}
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}
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#endif // FEATURE_PAL && !FEATURE_CORECLR
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return (hijriAdvance);
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#endif // FEATURE_WIN32_REGISTRY
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}
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static internal void CheckTicksRange(long ticks) {
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if (ticks < calendarMinValue.Ticks || ticks > calendarMaxValue.Ticks) {
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throw new ArgumentOutOfRangeException(
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"time",
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String.Format(
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CultureInfo.InvariantCulture,
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Environment.GetResourceString("ArgumentOutOfRange_CalendarRange"),
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calendarMinValue,
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calendarMaxValue));
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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 != HijriEra) {
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throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
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}
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}
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static internal void CheckYearRange(int year, int era) {
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CheckEraRange(era);
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if (year < 1 || year > MaxCalendarYear) {
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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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MaxCalendarYear));
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}
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}
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||
|
|
static internal void CheckYearMonthRange(int year, int month, int era) {
|
||
|
|
CheckYearRange(year, era);
|
||
|
|
if (year == MaxCalendarYear) {
|
||
|
|
if (month > MaxCalendarMonth) {
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"month",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Range"),
|
||
|
|
1,
|
||
|
|
MaxCalendarMonth));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (month < 1 || month > 12) {
|
||
|
|
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*=================================GetDatePart==========================
|
||
|
|
**Action: Returns a given date part of this <i>DateTime</i>. This method is used
|
||
|
|
** to compute the year, day-of-year, month, or day part.
|
||
|
|
**Returns:
|
||
|
|
**Arguments:
|
||
|
|
**Exceptions: ArgumentException if part is incorrect.
|
||
|
|
**Notes:
|
||
|
|
** First, we get the absolute date (the number of days from January 1st, 1 A.C) for the given ticks.
|
||
|
|
** Use the formula (((AbsoluteDate - 227013) * 30) / 10631) + 1, we can a rough value for the Hijri year.
|
||
|
|
** In order to get the exact Hijri year, we compare the exact absolute date for HijriYear and (HijriYear + 1).
|
||
|
|
** From here, we can get the correct Hijri year.
|
||
|
|
============================================================================*/
|
||
|
|
|
||
|
|
internal virtual int GetDatePart(long ticks, int part) {
|
||
|
|
int HijriYear; // Hijri year
|
||
|
|
int HijriMonth; // Hijri month
|
||
|
|
int HijriDay; // Hijri day
|
||
|
|
long NumDays; // The calculation buffer in number of days.
|
||
|
|
|
||
|
|
CheckTicksRange(ticks);
|
||
|
|
|
||
|
|
//
|
||
|
|
// Get the absolute date. The absolute date is the number of days from January 1st, 1 A.D.
|
||
|
|
// 1/1/0001 is absolute date 1.
|
||
|
|
//
|
||
|
|
NumDays = ticks / GregorianCalendar.TicksPerDay + 1;
|
||
|
|
|
||
|
|
//
|
||
|
|
// See how much we need to backup or advance
|
||
|
|
//
|
||
|
|
NumDays += HijriAdjustment;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Calculate the appromixate Hijri Year from this magic formula.
|
||
|
|
//
|
||
|
|
HijriYear = (int)(((NumDays - 227013) * 30) / 10631) + 1;
|
||
|
|
|
||
|
|
long daysToHijriYear = DaysUpToHijriYear(HijriYear); // The absoulte date for HijriYear
|
||
|
|
long daysOfHijriYear = GetDaysInYear(HijriYear, CurrentEra); // The number of days for (HijriYear+1) year.
|
||
|
|
|
||
|
|
if (NumDays < daysToHijriYear) {
|
||
|
|
daysToHijriYear -= daysOfHijriYear;
|
||
|
|
HijriYear--;
|
||
|
|
} else if (NumDays == daysToHijriYear) {
|
||
|
|
HijriYear--;
|
||
|
|
daysToHijriYear -= GetDaysInYear(HijriYear, CurrentEra);
|
||
|
|
} else {
|
||
|
|
if (NumDays > daysToHijriYear + daysOfHijriYear) {
|
||
|
|
daysToHijriYear += daysOfHijriYear;
|
||
|
|
HijriYear++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (part == DatePartYear) {
|
||
|
|
return (HijriYear);
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Calculate the Hijri Month.
|
||
|
|
//
|
||
|
|
|
||
|
|
HijriMonth = 1;
|
||
|
|
NumDays -= daysToHijriYear;
|
||
|
|
|
||
|
|
if (part == DatePartDayOfYear) {
|
||
|
|
return ((int)NumDays);
|
||
|
|
}
|
||
|
|
|
||
|
|
while ((HijriMonth <= 12) && (NumDays > HijriMonthDays[HijriMonth - 1])) {
|
||
|
|
HijriMonth++;
|
||
|
|
}
|
||
|
|
HijriMonth--;
|
||
|
|
|
||
|
|
if (part == DatePartMonth) {
|
||
|
|
return (HijriMonth);
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Calculate the Hijri Day.
|
||
|
|
//
|
||
|
|
HijriDay = (int)(NumDays - HijriMonthDays[HijriMonth - 1]);
|
||
|
|
|
||
|
|
if (part == DatePartDay) {
|
||
|
|
return (HijriDay);
|
||
|
|
}
|
||
|
|
// Incorrect part value.
|
||
|
|
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_DateTimeParsing"));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the DateTime resulting from adding the given number of
|
||
|
|
// months to the specified DateTime. The result is computed by incrementing
|
||
|
|
// (or decrementing) the year and month parts of the specified DateTime by
|
||
|
|
// value months, and, if required, adjusting the day part of the
|
||
|
|
// resulting date downwards to the last day of the resulting month in the
|
||
|
|
// resulting year. The time-of-day part of the result is the same as the
|
||
|
|
// time-of-day part of the specified DateTime.
|
||
|
|
//
|
||
|
|
// In more precise terms, considering the specified DateTime to be of the
|
||
|
|
// form y / m / d + t, where y is the
|
||
|
|
// year, m is the month, d is the day, and t is the
|
||
|
|
// time-of-day, the result is y1 / m1 / d1 + t,
|
||
|
|
// where y1 and m1 are computed by adding value months
|
||
|
|
// to y and m, and d1 is the largest value less than
|
||
|
|
// or equal to d that denotes a valid day in month m1 of year
|
||
|
|
// y1.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override DateTime AddMonths(DateTime time, int months) {
|
||
|
|
if (months < -120000 || months > 120000) {
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"months",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Range"),
|
||
|
|
-120000,
|
||
|
|
120000));
|
||
|
|
}
|
||
|
|
Contract.EndContractBlock();
|
||
|
|
// Get the date in Hijri calendar.
|
||
|
|
int y = GetDatePart(time.Ticks, DatePartYear);
|
||
|
|
int m = GetDatePart(time.Ticks, DatePartMonth);
|
||
|
|
int d = GetDatePart(time.Ticks, DatePartDay);
|
||
|
|
int i = m - 1 + months;
|
||
|
|
if (i >= 0) {
|
||
|
|
m = i % 12 + 1;
|
||
|
|
y = y + i / 12;
|
||
|
|
} else {
|
||
|
|
m = 12 + (i + 1) % 12;
|
||
|
|
y = y + (i - 11) / 12;
|
||
|
|
}
|
||
|
|
int days = GetDaysInMonth(y, m);
|
||
|
|
if (d > days) {
|
||
|
|
d = days;
|
||
|
|
}
|
||
|
|
long ticks = GetAbsoluteDateHijri(y, m, d)* TicksPerDay + (time.Ticks % TicksPerDay);
|
||
|
|
Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime);
|
||
|
|
return (new DateTime(ticks));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the DateTime resulting from adding the given number of
|
||
|
|
// years to the specified DateTime. The result is computed by incrementing
|
||
|
|
// (or decrementing) the year part of the specified DateTime by value
|
||
|
|
// years. If the month and day of the specified DateTime is 2/29, and if the
|
||
|
|
// resulting year is not a leap year, the month and day of the resulting
|
||
|
|
// DateTime becomes 2/28. Otherwise, the month, day, and time-of-day
|
||
|
|
// parts of the result are the same as those of the specified DateTime.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override DateTime AddYears(DateTime time, int years) {
|
||
|
|
return (AddMonths(time, years * 12));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the day-of-month part of the specified DateTime. The returned
|
||
|
|
// value is an integer between 1 and 31.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override int GetDayOfMonth(DateTime time) {
|
||
|
|
return (GetDatePart(time.Ticks, DatePartDay));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the day-of-week part of the specified DateTime. The returned value
|
||
|
|
// is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates
|
||
|
|
// Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates
|
||
|
|
// Thursday, 5 indicates Friday, and 6 indicates Saturday.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override DayOfWeek GetDayOfWeek(DateTime time) {
|
||
|
|
return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the day-of-year part of the specified DateTime. The returned value
|
||
|
|
// is an integer between 1 and 366.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override int GetDayOfYear(DateTime time) {
|
||
|
|
return (GetDatePart(time.Ticks, DatePartDayOfYear));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the number of days in the month given by the year and
|
||
|
|
// month arguments.
|
||
|
|
//
|
||
|
|
[Pure]
|
||
|
|
public override int GetDaysInMonth(int year, int month, int era) {
|
||
|
|
CheckYearMonthRange(year, month, era);
|
||
|
|
if (month == 12) {
|
||
|
|
// For the 12th month, leap year has 30 days, and common year has 29 days.
|
||
|
|
return (IsLeapYear(year, CurrentEra) ? 30 : 29);
|
||
|
|
}
|
||
|
|
// Other months contain 30 and 29 days alternatively. The 1st month has 30 days.
|
||
|
|
return (((month % 2) == 1) ? 30 : 29);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the number of days in the year given by the year argument for the current era.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override int GetDaysInYear(int year, int era) {
|
||
|
|
CheckYearRange(year, era);
|
||
|
|
// Common years have 354 days. Leap years have 355 days.
|
||
|
|
return (IsLeapYear(year, CurrentEra) ? 355: 354);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the era for the specified DateTime value.
|
||
|
|
|
||
|
|
public override int GetEra(DateTime time) {
|
||
|
|
CheckTicksRange(time.Ticks);
|
||
|
|
return (HijriEra);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
public override int[] Eras {
|
||
|
|
get {
|
||
|
|
return (new int[] {HijriEra});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the month part of the specified DateTime. The returned value is an
|
||
|
|
// integer between 1 and 12.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override int GetMonth(DateTime time) {
|
||
|
|
return (GetDatePart(time.Ticks, DatePartMonth));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the number of months in the specified year and era.
|
||
|
|
|
||
|
|
public override int GetMonthsInYear(int year, int era) {
|
||
|
|
CheckYearRange(year, era);
|
||
|
|
return (12);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the year part of the specified DateTime. The returned value is an
|
||
|
|
// integer between 1 and MaxCalendarYear.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override int GetYear(DateTime time) {
|
||
|
|
return (GetDatePart(time.Ticks, DatePartYear));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Checks whether a given day in the specified era is a leap day. This method returns true if
|
||
|
|
// the date is a leap day, or false if not.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override bool IsLeapDay(int year, int month, int day, int era) {
|
||
|
|
// The year/month/era value checking is done in GetDaysInMonth().
|
||
|
|
int daysInMonth = GetDaysInMonth(year, month, era);
|
||
|
|
if (day < 1 || day > daysInMonth) {
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"day",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Day"),
|
||
|
|
daysInMonth,
|
||
|
|
month));
|
||
|
|
}
|
||
|
|
return (IsLeapYear(year, era) && month == 12 && day == 30);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the leap month in a calendar year of the specified era. This method returns 0
|
||
|
|
// if this calendar does not have leap month, or this year is not a leap year.
|
||
|
|
//
|
||
|
|
|
||
|
|
[System.Runtime.InteropServices.ComVisible(false)]
|
||
|
|
public override int GetLeapMonth(int year, int era)
|
||
|
|
{
|
||
|
|
CheckYearRange(year, era);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Checks whether a given month in the specified era is a leap month. This method returns true if
|
||
|
|
// month is a leap month, or false if not.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override bool IsLeapMonth(int year, int month, int era) {
|
||
|
|
CheckYearMonthRange(year, month, era);
|
||
|
|
return (false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Checks whether a given year in the specified era is a leap year. This method returns true if
|
||
|
|
// year is a leap year, or false if not.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override bool IsLeapYear(int year, int era) {
|
||
|
|
CheckYearRange(year, era);
|
||
|
|
return ((((year * 11) + 14) % 30) < 11);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns the date and time converted to a DateTime value. Throws an exception if the n-tuple is invalid.
|
||
|
|
//
|
||
|
|
|
||
|
|
public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era) {
|
||
|
|
// The year/month/era checking is done in GetDaysInMonth().
|
||
|
|
int daysInMonth = GetDaysInMonth(year, month, era);
|
||
|
|
if (day < 1 || day > daysInMonth) {
|
||
|
|
BCLDebug.Log("year = " + year + ", month = " + month + ", day = " + day);
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"day",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Day"),
|
||
|
|
daysInMonth,
|
||
|
|
month));
|
||
|
|
}
|
||
|
|
|
||
|
|
long lDate = GetAbsoluteDateHijri(year, month, day);
|
||
|
|
|
||
|
|
if (lDate >= 0) {
|
||
|
|
return (new DateTime(lDate * GregorianCalendar.TicksPerDay + TimeToTicks(hour, minute, second, millisecond)));
|
||
|
|
} else {
|
||
|
|
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 1451;
|
||
|
|
|
||
|
|
|
||
|
|
public override int TwoDigitYearMax {
|
||
|
|
get {
|
||
|
|
if (twoDigitYearMax == -1) {
|
||
|
|
twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX);
|
||
|
|
}
|
||
|
|
return (twoDigitYearMax);
|
||
|
|
}
|
||
|
|
|
||
|
|
set {
|
||
|
|
VerifyWritable();
|
||
|
|
if (value < 99 || value > MaxCalendarYear)
|
||
|
|
{
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"value",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Range"),
|
||
|
|
99,
|
||
|
|
MaxCalendarYear));
|
||
|
|
|
||
|
|
}
|
||
|
|
twoDigitYearMax = value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
public override int ToFourDigitYear(int year) {
|
||
|
|
if (year < 0) {
|
||
|
|
throw new ArgumentOutOfRangeException("year",
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
|
||
|
|
}
|
||
|
|
Contract.EndContractBlock();
|
||
|
|
|
||
|
|
if (year < 100) {
|
||
|
|
return (base.ToFourDigitYear(year));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (year > MaxCalendarYear) {
|
||
|
|
throw new ArgumentOutOfRangeException(
|
||
|
|
"year",
|
||
|
|
String.Format(
|
||
|
|
CultureInfo.CurrentCulture,
|
||
|
|
Environment.GetResourceString("ArgumentOutOfRange_Range"),
|
||
|
|
1,
|
||
|
|
MaxCalendarYear));
|
||
|
|
}
|
||
|
|
return (year);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|