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authorJiyoung Yun <jy910.yun@samsung.com>2016-11-23 19:09:09 +0900
committerJiyoung Yun <jy910.yun@samsung.com>2016-11-23 19:09:09 +0900
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Globalization {
+ using System;
+ using System.Text;
+ using System.Diagnostics.Contracts;
+
+ ////////////////////////////////////////////////////////////////////////////
+ //
+ // Rules for the Hebrew calendar:
+ // - The Hebrew calendar is both a Lunar (months) and Solar (years)
+ // calendar, but allows for a week of seven days.
+ // - Days begin at sunset.
+ // - Leap Years occur in the 3, 6, 8, 11, 14, 17, & 19th years of a
+ // 19-year cycle. Year = leap iff ((7y+1) mod 19 < 7).
+ // - There are 12 months in a common year and 13 months in a leap year.
+ // - In a common year, the 6th month, Adar, has 29 days. In a leap
+ // year, the 6th month, Adar I, has 30 days and the leap month,
+ // Adar II, has 29 days.
+ // - Common years have 353-355 days. Leap years have 383-385 days.
+ // - The Hebrew new year (Rosh HaShanah) begins on the 1st of Tishri,
+ // the 7th month in the list below.
+ // - The new year may not begin on Sunday, Wednesday, or Friday.
+ // - If the new year would fall on a Tuesday and the conjunction of
+ // the following year were at midday or later, the new year is
+ // delayed until Thursday.
+ // - If the new year would fall on a Monday after a leap year, the
+ // new year is delayed until Tuesday.
+ // - The length of the 8th and 9th months vary from year to year,
+ // depending on the overall length of the year.
+ // - The length of a year is determined by the dates of the new
+ // years (Tishri 1) preceding and following the year in question.
+ // - The 2th month is long (30 days) if the year has 355 or 385 days.
+ // - The 3th month is short (29 days) if the year has 353 or 383 days.
+ // - The Hebrew months are:
+ // 1. Tishri (30 days)
+ // 2. Heshvan (29 or 30 days)
+ // 3. Kislev (29 or 30 days)
+ // 4. Teveth (29 days)
+ // 5. Shevat (30 days)
+ // 6. Adar I (30 days)
+ // 7. Adar {II} (29 days, this only exists if that year is a leap year)
+ // 8. Nisan (30 days)
+ // 9. Iyyar (29 days)
+ // 10. Sivan (30 days)
+ // 11. Tammuz (29 days)
+ // 12. Av (30 days)
+ // 13. Elul (29 days)
+ //
+ ////////////////////////////////////////////////////////////////////////////
+ /*
+ ** Calendar support range:
+ ** Calendar Minimum Maximum
+ ** ========== ========== ==========
+ ** Gregorian 1583/01/01 2239/09/29
+ ** Hebrew 5343/04/07 5999/13/29
+ */
+
+// Includes CHebrew implemetation;i.e All the code necessary for converting
+// Gregorian to Hebrew Lunar from 1583 to 2239.
+
+
+ [Serializable]
+[System.Runtime.InteropServices.ComVisible(true)]
+ public class HebrewCalendar : Calendar {
+
+
+ public static readonly int HebrewEra = 1;
+
+ internal const int DatePartYear = 0;
+ internal const int DatePartDayOfYear = 1;
+ internal const int DatePartMonth = 2;
+ internal const int DatePartDay = 3;
+ internal const int DatePartDayOfWeek = 4;
+
+ //
+ // Hebrew Translation Table.
+ //
+ // This table is used to get the following Hebrew calendar information for a
+ // given Gregorian year:
+ // 1. The day of the Hebrew month corresponding to Gregorian January 1st
+ // for a given Gregorian year.
+ // 2. The month of the Hebrew month corresponding to Gregorian January 1st
+ // for a given Gregorian year.
+ // The information is not directly in the table. Instead, the info is decoded
+ // by special values (numbers above 29 and below 1).
+ // 3. The type of the Hebrew year for a given Gregorian year.
+ //
+
+ /*
+ More notes:
+
+ This table includes 2 numbers for each year.
+ The offset into the table determines the year. (offset 0 is Gregorian year 1500)
+ 1st number determines the day of the Hebrew month coresponeds to January 1st.
+ 2nd number determines the type of the Hebrew year. (the type determines how
+ many days are there in the year.)
+
+ normal years : 1 = 353 days 2 = 354 days 3 = 355 days.
+ Leap years : 4 = 383 5 384 6 = 385 days.
+
+ A 99 means the year is not supported for translation.
+ for convenience the table was defined for 750 year,
+ but only 640 years are supported. (from 1583 to 2239)
+ the years before 1582 (starting of Georgian calander)
+ and after 2239, are filled with 99.
+
+ Greogrian January 1st falls usually in Tevet (4th month). Tevet has always 29 days.
+ That's why, there no nead to specify the lunar month in the table.
+ There are exceptions, these are coded by giving numbers above 29 and below 1.
+ Actual decoding is takenig place whenever fetching information from the table.
+ The function for decoding is in GetLunarMonthDay().
+
+ Example:
+ The data for 2000 - 2005 A.D. is:
+
+ 23,6,6,1,17,2,27,6,7,3, // 2000 - 2004
+
+ For year 2000, we know it has a Hebrew year type 6, which means it has 385 days.
+ And 1/1/2000 A.D. is Hebrew year 5760, 23rd day of 4th month.
+ */
+
+ //
+ // Jewish Era in use today is dated from the supposed year of the
+ // Creation with its beginning in 3761 B.C.
+ //
+
+ // The Hebrew year of Gregorian 1st year AD.
+ // 0001/01/01 AD is Hebrew 3760/01/01
+ private const int HebrewYearOf1AD = 3760;
+
+ // The first Gregorian year in HebrewTable.
+ private const int FirstGregorianTableYear = 1583; // == Hebrew Year 5343
+ // The last Gregorian year in HebrewTable.
+ private const int LastGregorianTableYear = 2239; // == Hebrew Year 5999
+ private const int TABLESIZE = (LastGregorianTableYear-FirstGregorianTableYear);
+
+ private const int MinHebrewYear = HebrewYearOf1AD + FirstGregorianTableYear; // == 5343
+ private const int MaxHebrewYear = HebrewYearOf1AD + LastGregorianTableYear; // == 5999
+
+ private static readonly int[] HebrewTable = {
+ 7,3,17,3, // 1583-1584 (Hebrew year: 5343 - 5344)
+ 0,4,11,2,21,6,1,3,13,2, // 1585-1589
+ 25,4,5,3,16,2,27,6,9,1, // 1590-1594
+ 20,2,0,6,11,3,23,4,4,2, // 1595-1599
+ 14,3,27,4,8,2,18,3,28,6, // 1600
+ 11,1,22,5,2,3,12,3,25,4, // 1605
+ 6,2,16,3,26,6,8,2,20,1, // 1610
+ 0,6,11,2,24,4,4,3,15,2, // 1615
+ 25,6,8,1,19,2,29,6,9,3, // 1620
+ 22,4,3,2,13,3,25,4,6,3, // 1625
+ 17,2,27,6,7,3,19,2,31,4, // 1630
+ 11,3,23,4,5,2,15,3,25,6, // 1635
+ 6,2,19,1,29,6,10,2,22,4, // 1640
+ 3,3,14,2,24,6,6,1,17,3, // 1645
+ 28,5,8,3,20,1,32,5,12,3, // 1650
+ 22,6,4,1,16,2,26,6,6,3, // 1655
+ 17,2,0,4,10,3,22,4,3,2, // 1660
+ 14,3,24,6,5,2,17,1,28,6, // 1665
+ 9,2,19,3,31,4,13,2,23,6, // 1670
+ 3,3,15,1,27,5,7,3,17,3, // 1675
+ 29,4,11,2,21,6,3,1,14,2, // 1680
+ 25,6,5,3,16,2,28,4,9,3, // 1685
+ 20,2,0,6,12,1,23,6,4,2, // 1690
+ 14,3,26,4,8,2,18,3,0,4, // 1695
+ 10,3,21,5,1,3,13,1,24,5, // 1700
+ 5,3,15,3,27,4,8,2,19,3, // 1705
+ 29,6,10,2,22,4,3,3,14,2, // 1710
+ 26,4,6,3,18,2,28,6,10,1, // 1715
+ 20,6,2,2,12,3,24,4,5,2, // 1720
+ 16,3,28,4,8,3,19,2,0,6, // 1725
+ 12,1,23,5,3,3,14,3,26,4, // 1730
+ 7,2,17,3,28,6,9,2,21,4, // 1735
+ 1,3,13,2,25,4,5,3,16,2, // 1740
+ 27,6,9,1,19,3,0,5,11,3, // 1745
+ 23,4,4,2,14,3,25,6,7,1, // 1750
+ 18,2,28,6,9,3,21,4,2,2, // 1755
+ 12,3,25,4,6,2,16,3,26,6, // 1760
+ 8,2,20,1,0,6,11,2,22,6, // 1765
+ 4,1,15,2,25,6,6,3,18,1, // 1770
+ 29,5,9,3,22,4,2,3,13,2, // 1775
+ 23,6,4,3,15,2,27,4,7,3, // 1780
+ 19,2,31,4,11,3,21,6,3,2, // 1785
+ 15,1,25,6,6,2,17,3,29,4, // 1790
+ 10,2,20,6,3,1,13,3,24,5, // 1795
+ 4,3,16,1,27,5,7,3,17,3, // 1800
+ 0,4,11,2,21,6,1,3,13,2, // 1805
+ 25,4,5,3,16,2,29,4,9,3, // 1810
+ 19,6,30,2,13,1,23,6,4,2, // 1815
+ 14,3,27,4,8,2,18,3,0,4, // 1820
+ 11,3,22,5,2,3,14,1,26,5, // 1825
+ 6,3,16,3,28,4,10,2,20,6, // 1830
+ 30,3,11,2,24,4,4,3,15,2, // 1835
+ 25,6,8,1,19,2,29,6,9,3, // 1840
+ 22,4,3,2,13,3,25,4,7,2, // 1845
+ 17,3,27,6,9,1,21,5,1,3, // 1850
+ 11,3,23,4,5,2,15,3,25,6, // 1855
+ 6,2,19,1,29,6,10,2,22,4, // 1860
+ 3,3,14,2,24,6,6,1,18,2, // 1865
+ 28,6,8,3,20,4,2,2,12,3, // 1870
+ 24,4,4,3,16,2,26,6,6,3, // 1875
+ 17,2,0,4,10,3,22,4,3,2, // 1880
+ 14,3,24,6,5,2,17,1,28,6, // 1885
+ 9,2,21,4,1,3,13,2,23,6, // 1890
+ 5,1,15,3,27,5,7,3,19,1, // 1895
+ 0,5,10,3,22,4,2,3,13,2, // 1900
+ 24,6,4,3,15,2,27,4,8,3, // 1905
+ 20,4,1,2,11,3,22,6,3,2, // 1910
+ 15,1,25,6,7,2,17,3,29,4, // 1915
+ 10,2,21,6,1,3,13,1,24,5, // 1920
+ 5,3,15,3,27,4,8,2,19,6, // 1925
+ 1,1,12,2,22,6,3,3,14,2, // 1930
+ 26,4,6,3,18,2,28,6,10,1, // 1935
+ 20,6,2,2,12,3,24,4,5,2, // 1940
+ 16,3,28,4,9,2,19,6,30,3, // 1945
+ 12,1,23,5,3,3,14,3,26,4, // 1950
+ 7,2,17,3,28,6,9,2,21,4, // 1955
+ 1,3,13,2,25,4,5,3,16,2, // 1960
+ 27,6,9,1,19,6,30,2,11,3, // 1965
+ 23,4,4,2,14,3,27,4,7,3, // 1970
+ 18,2,28,6,11,1,22,5,2,3, // 1975
+ 12,3,25,4,6,2,16,3,26,6, // 1980
+ 8,2,20,4,30,3,11,2,24,4, // 1985
+ 4,3,15,2,25,6,8,1,18,3, // 1990
+ 29,5,9,3,22,4,3,2,13,3, // 1995
+ 23,6,6,1,17,2,27,6,7,3, // 2000 - 2004
+ 20,4,1,2,11,3,23,4,5,2, // 2005 - 2009
+ 15,3,25,6,6,2,19,1,29,6, // 2010
+ 10,2,20,6,3,1,14,2,24,6, // 2015
+ 4,3,17,1,28,5,8,3,20,4, // 2020
+ 1,3,12,2,22,6,2,3,14,2, // 2025
+ 26,4,6,3,17,2,0,4,10,3, // 2030
+ 20,6,1,2,14,1,24,6,5,2, // 2035
+ 15,3,28,4,9,2,19,6,1,1, // 2040
+ 12,3,23,5,3,3,15,1,27,5, // 2045
+ 7,3,17,3,29,4,11,2,21,6, // 2050
+ 1,3,12,2,25,4,5,3,16,2, // 2055
+ 28,4,9,3,19,6,30,2,12,1, // 2060
+ 23,6,4,2,14,3,26,4,8,2, // 2065
+ 18,3,0,4,10,3,22,5,2,3, // 2070
+ 14,1,25,5,6,3,16,3,28,4, // 2075
+ 9,2,20,6,30,3,11,2,23,4, // 2080
+ 4,3,15,2,27,4,7,3,19,2, // 2085
+ 29,6,11,1,21,6,3,2,13,3, // 2090
+ 25,4,6,2,17,3,27,6,9,1, // 2095
+ 20,5,30,3,10,3,22,4,3,2, // 2100
+ 14,3,24,6,5,2,17,1,28,6, // 2105
+ 9,2,21,4,1,3,13,2,23,6, // 2110
+ 5,1,16,2,27,6,7,3,19,4, // 2115
+ 30,2,11,3,23,4,3,3,14,2, // 2120
+ 25,6,5,3,16,2,28,4,9,3, // 2125
+ 21,4,2,2,12,3,23,6,4,2, // 2130
+ 16,1,26,6,8,2,20,4,30,3, // 2135
+ 11,2,22,6,4,1,14,3,25,5, // 2140
+ 6,3,18,1,29,5,9,3,22,4, // 2145
+ 2,3,13,2,23,6,4,3,15,2, // 2150
+ 27,4,7,3,20,4,1,2,11,3, // 2155
+ 21,6,3,2,15,1,25,6,6,2, // 2160
+ 17,3,29,4,10,2,20,6,3,1, // 2165
+ 13,3,24,5,4,3,17,1,28,5, // 2170
+ 8,3,18,6,1,1,12,2,22,6, // 2175
+ 2,3,14,2,26,4,6,3,17,2, // 2180
+ 28,6,10,1,20,6,1,2,12,3, // 2185
+ 24,4,5,2,15,3,28,4,9,2, // 2190
+ 19,6,33,3,12,1,23,5,3,3, // 2195
+ 13,3,25,4,6,2,16,3,26,6, // 2200
+ 8,2,20,4,30,3,11,2,24,4, // 2205
+ 4,3,15,2,25,6,8,1,18,6, // 2210
+ 33,2,9,3,22,4,3,2,13,3, // 2215
+ 25,4,6,3,17,2,27,6,9,1, // 2220
+ 21,5,1,3,11,3,23,4,5,2, // 2225
+ 15,3,25,6,6,2,19,4,33,3, // 2230
+ 10,2,22,4,3,3,14,2,24,6, // 2235
+ 6,1 // 2240 (Hebrew year: 6000)
+ };
+
+ //
+ // The lunar calendar has 6 different variations of month lengths
+ // within a year.
+ //
+ private static readonly int[,] LunarMonthLen = {
+ {0,00,00,00,00,00,00,00,00,00,00,00,00,0},
+ {0,30,29,29,29,30,29,30,29,30,29,30,29,0}, // 3 common year variations
+ {0,30,29,30,29,30,29,30,29,30,29,30,29,0},
+ {0,30,30,30,29,30,29,30,29,30,29,30,29,0},
+ {0,30,29,29,29,30,30,29,30,29,30,29,30,29}, // 3 leap year variations
+ {0,30,29,30,29,30,30,29,30,29,30,29,30,29},
+ {0,30,30,30,29,30,30,29,30,29,30,29,30,29}
+ };
+
+ //internal static Calendar m_defaultInstance;
+
+ internal static readonly DateTime calendarMinValue = new DateTime(1583, 1, 1);
+ // Gregorian 2239/9/29 = Hebrew 5999/13/29 (last day in Hebrew year 5999).
+ // We can only format/parse Hebrew numbers up to 999, so we limit the max range to Hebrew year 5999.
+ internal static readonly DateTime calendarMaxValue = new DateTime((new DateTime(2239, 9, 29, 23, 59, 59, 999)).Ticks + 9999);
+
+
+
+ public override DateTime MinSupportedDateTime
+ {
+ get
+ {
+ return (calendarMinValue);
+ }
+ }
+
+
+
+ public override DateTime MaxSupportedDateTime
+ {
+ get
+ {
+ return (calendarMaxValue);
+ }
+ }
+
+
+ // Return the type of the Hebrew calendar.
+ //
+
+
+ public override CalendarAlgorithmType AlgorithmType
+ {
+ get
+ {
+ return CalendarAlgorithmType.LunisolarCalendar;
+ }
+ }
+
+ /*=================================GetDefaultInstance==========================
+ **Action: Internal method to provide a default intance of HebrewCalendar. Used by NLS+ implementation
+ ** and other calendars.
+ **Returns:
+ **Arguments:
+ **Exceptions:
+ ============================================================================*/
+
+ /*
+ internal static Calendar GetDefaultInstance() {
+ if (m_defaultInstance == null) {
+ m_defaultInstance = new HebrewCalendar();
+ }
+ return (m_defaultInstance);
+ }
+ */
+
+
+ // Construct an instance of gregorian calendar.
+
+ public HebrewCalendar() {
+ }
+
+ internal override int ID {
+ get {
+ return (CAL_HEBREW);
+ }
+ }
+
+
+ /*=================================CheckHebrewYearValue==========================
+ **Action: Check if the Hebrew year value is supported in this class.
+ **Returns: None.
+ **Arguments: y Hebrew year value
+ ** ear Hebrew era value
+ **Exceptions: ArgumentOutOfRange_Range if the year value is not supported.
+ **Note:
+ ** We use a table for the Hebrew calendar calculation, so the year supported is limited.
+ ============================================================================*/
+
+ static private void CheckHebrewYearValue(int y, int era, String varName) {
+ CheckEraRange(era);
+ if (y > MaxHebrewYear || y < MinHebrewYear) {
+ throw new ArgumentOutOfRangeException(
+ varName,
+ String.Format(
+ CultureInfo.CurrentCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_Range"),
+ MinHebrewYear,
+ MaxHebrewYear));
+ }
+ }
+
+ /*=================================CheckHebrewMonthValue==========================
+ **Action: Check if the Hebrew month value is valid.
+ **Returns: None.
+ **Arguments: year Hebrew year value
+ ** month Hebrew month value
+ **Exceptions: ArgumentOutOfRange_Range if the month value is not valid.
+ **Note:
+ ** Call CheckHebrewYearValue() before calling this to verify the year value is supported.
+ ============================================================================*/
+
+ private void CheckHebrewMonthValue(int year, int month, int era) {
+ int monthsInYear = GetMonthsInYear(year, era);
+ if (month < 1 || month > monthsInYear) {
+ throw new ArgumentOutOfRangeException(
+ "month",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_Range"),
+ 1,
+ monthsInYear));
+ }
+ }
+
+ /*=================================CheckHebrewDayValue==========================
+ **Action: Check if the Hebrew day value is valid.
+ **Returns: None.
+ **Arguments: year Hebrew year value
+ ** month Hebrew month value
+ ** day Hebrew day value.
+ **Exceptions: ArgumentOutOfRange_Range if the day value is not valid.
+ **Note:
+ ** Call CheckHebrewYearValue()/CheckHebrewMonthValue() before calling this to verify the year/month values are valid.
+ ============================================================================*/
+
+ private void CheckHebrewDayValue(int year, int month, int day, int era) {
+ int daysInMonth = GetDaysInMonth(year, month, era);
+ if (day < 1 || day > daysInMonth) {
+ throw new ArgumentOutOfRangeException(
+ "day",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_Range"),
+ 1,
+ daysInMonth));
+ }
+ }
+
+ static internal void CheckEraRange(int era) {
+ if (era != CurrentEra && era != HebrewEra) {
+ throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
+ }
+ }
+
+ static private void CheckTicksRange(long ticks) {
+ if (ticks < calendarMinValue.Ticks || ticks > calendarMaxValue.Ticks) {
+ throw new ArgumentOutOfRangeException(
+ "time",
+ // Print out the date in Gregorian using InvariantCulture since the DateTime is based on GreograinCalendar.
+ String.Format(
+ CultureInfo.InvariantCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_CalendarRange"),
+ calendarMinValue,
+ calendarMaxValue));
+ }
+ }
+
+ static internal int GetResult(__DateBuffer result, int part) {
+ switch (part) {
+ case DatePartYear:
+ return (result.year);
+ case DatePartMonth:
+ return (result.month);
+ case DatePartDay:
+ return (result.day);
+ }
+
+ throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_DateTimeParsing"));
+ }
+
+ /*=================================GetLunarMonthDay==========================
+ **Action: Using the Hebrew table (HebrewTable) to get the Hebrew month/day value for Gregorian January 1st
+ ** in a given Gregorian year.
+ ** Greogrian January 1st falls usually in Tevet (4th month). Tevet has always 29 days.
+ ** That's why, there no nead to specify the lunar month in the table. There are exceptions, and these
+ ** are coded by giving numbers above 29 and below 1.
+ ** Actual decoding is takenig place in the switch statement below.
+ **Returns:
+ ** The Hebrew year type. The value is from 1 to 6.
+ ** normal years : 1 = 353 days 2 = 354 days 3 = 355 days.
+ ** Leap years : 4 = 383 5 384 6 = 385 days.
+ **Arguments:
+ ** gregorianYear The year value in Gregorian calendar. The value should be between 1500 and 2239.
+ ** lunarDate Object to take the result of the Hebrew year/month/day.
+ **Exceptions:
+ ============================================================================*/
+
+ static internal int GetLunarMonthDay(int gregorianYear, __DateBuffer lunarDate) {
+ //
+ // Get the offset into the LunarMonthLen array and the lunar day
+ // for January 1st.
+ //
+ int index = gregorianYear - FirstGregorianTableYear;
+ if (index < 0 || index > TABLESIZE) {
+ throw new ArgumentOutOfRangeException("gregorianYear");
+ }
+
+ index *= 2;
+ lunarDate.day = HebrewTable[index];
+
+ // Get the type of the year. The value is from 1 to 6
+ int LunarYearType = HebrewTable[index + 1];
+
+ //
+ // Get the Lunar Month.
+ //
+ switch (lunarDate.day) {
+ case ( 0 ) : // 1/1 is on Shvat 1
+ lunarDate.month = 5;
+ lunarDate.day = 1;
+ break;
+ case ( 30 ) : // 1/1 is on Kislev 30
+ lunarDate.month = 3;
+ break;
+ case ( 31 ) : // 1/1 is on Shvat 2
+ lunarDate.month = 5;
+ lunarDate.day = 2;
+ break;
+ case ( 32 ) : // 1/1 is on Shvat 3
+ lunarDate.month = 5;
+ lunarDate.day = 3;
+ break;
+ case ( 33 ) : // 1/1 is on Kislev 29
+ lunarDate.month = 3;
+ lunarDate.day = 29;
+ break;
+ default : // 1/1 is on Tevet (This is the general case)
+ lunarDate.month = 4;
+ break;
+ }
+ return (LunarYearType);
+ }
+
+ // Returns a given date part of this DateTime. This method is used
+ // to compute the year, day-of-year, month, or day part.
+
+ internal virtual int GetDatePart(long ticks, int part) {
+ // The Gregorian year, month, day value for ticks.
+ int gregorianYear, gregorianMonth, gregorianDay;
+ int hebrewYearType; // lunar year type
+ long AbsoluteDate; // absolute date - absolute date 1/1/1600
+
+ //
+ // Make sure we have a valid Gregorian date that will fit into our
+ // Hebrew conversion limits.
+ //
+ CheckTicksRange(ticks);
+
+ DateTime time = new DateTime(ticks);
+
+ //
+ // Save the Gregorian date values.
+ //
+ gregorianYear = time.Year;
+ gregorianMonth = time.Month;
+ gregorianDay = time.Day;
+
+ __DateBuffer lunarDate = new __DateBuffer(); // lunar month and day for Jan 1
+
+ // From the table looking-up value of HebrewTable[index] (stored in lunarDate.day), we get the the
+ // lunar month and lunar day where the Gregorian date 1/1 falls.
+ lunarDate.year = gregorianYear + HebrewYearOf1AD;
+ hebrewYearType = GetLunarMonthDay(gregorianYear, lunarDate);
+
+ // This is the buffer used to store the result Hebrew date.
+ __DateBuffer result = new __DateBuffer();
+
+ //
+ // Store the values for the start of the new year - 1/1.
+ //
+ result.year = lunarDate.year;
+ result.month = lunarDate.month;
+ result.day = lunarDate.day;
+
+ //
+ // Get the absolute date from 1/1/1600.
+ //
+ AbsoluteDate = GregorianCalendar.GetAbsoluteDate(gregorianYear, gregorianMonth, gregorianDay);
+
+ //
+ // If the requested date was 1/1, then we're done.
+ //
+ if ((gregorianMonth == 1) && (gregorianDay == 1)) {
+ return (GetResult(result, part));
+ }
+
+ //
+ // Calculate the number of days between 1/1 and the requested date.
+ //
+ long NumDays; // number of days since 1/1
+ NumDays = AbsoluteDate - GregorianCalendar.GetAbsoluteDate(gregorianYear, 1, 1);
+
+ //
+ // If the requested date is within the current lunar month, then
+ // we're done.
+ //
+ if ((NumDays + (long)lunarDate.day) <= (long)(LunarMonthLen[hebrewYearType, lunarDate.month])) {
+ result.day += (int)NumDays;
+ return (GetResult(result, part));
+ }
+
+ //
+ // Adjust for the current partial month.
+ //
+ result.month++;
+ result.day = 1;
+
+ //
+ // Adjust the Lunar Month and Year (if necessary) based on the number
+ // of days between 1/1 and the requested date.
+ //
+ // Assumes Jan 1 can never translate to the last Lunar month, which
+ // is true.
+ //
+ NumDays -= (long)(LunarMonthLen[hebrewYearType, lunarDate.month] - lunarDate.day);
+ Contract.Assert(NumDays >= 1, "NumDays >= 1");
+
+ // If NumDays is 1, then we are done. Otherwise, find the correct Hebrew month
+ // and day.
+ if (NumDays > 1) {
+ //
+ // See if we're on the correct Lunar month.
+ //
+ while (NumDays > (long)(LunarMonthLen[hebrewYearType, result.month])) {
+ //
+ // Adjust the number of days and move to the next month.
+ //
+ NumDays -= (long)(LunarMonthLen[hebrewYearType, result.month++]);
+
+ //
+ // See if we need to adjust the Year.
+ // Must handle both 12 and 13 month years.
+ //
+ if ((result.month > 13) || (LunarMonthLen[hebrewYearType, result.month] == 0)) {
+ //
+ // Adjust the Year.
+ //
+ result.year++;
+ hebrewYearType = HebrewTable[(gregorianYear + 1 - FirstGregorianTableYear) * 2 + 1];
+
+ //
+ // Adjust the Month.
+ //
+ result.month = 1;
+ }
+ }
+ //
+ // Found the right Lunar month.
+ //
+ result.day += (int)(NumDays - 1);
+ }
+ return (GetResult(result, part));
+ }
+
+ // 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) {
+ try {
+ int y = GetDatePart(time.Ticks, DatePartYear);
+ int m = GetDatePart(time.Ticks, DatePartMonth);
+ int d = GetDatePart(time.Ticks, DatePartDay);
+
+
+ int monthsInYear;
+ int i;
+ if (months >= 0) {
+ i = m + months;
+ while (i > (monthsInYear = GetMonthsInYear(y, CurrentEra))) {
+ y++;
+ i -= monthsInYear;
+ }
+ } else {
+ if ((i = m + months) <= 0) {
+ months = -months;
+ months -= m;
+ y--;
+
+ while (months > (monthsInYear = GetMonthsInYear(y, CurrentEra))) {
+ y--;
+ months -= monthsInYear;
+ }
+ monthsInYear = GetMonthsInYear(y, CurrentEra);
+ i = monthsInYear - months;
+ }
+ }
+
+ int days = GetDaysInMonth(y, i);
+ if (d > days) {
+ d = days;
+ }
+ return (new DateTime(ToDateTime(y, i, d, 0, 0, 0, 0).Ticks + (time.Ticks % TicksPerDay)));
+ }
+ // We expect ArgumentException and ArgumentOutOfRangeException (which is subclass of ArgumentException)
+ // If exception is thrown in the calls above, we are out of the supported range of this calendar.
+ catch (ArgumentException)
+ {
+ throw new ArgumentOutOfRangeException(
+ "months",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_AddValue")));
+ }
+ }
+
+ // 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) {
+ int y = GetDatePart(time.Ticks, DatePartYear);
+ int m = GetDatePart(time.Ticks, DatePartMonth);
+ int d = GetDatePart(time.Ticks, DatePartDay);
+
+ y += years;
+ CheckHebrewYearValue(y, Calendar.CurrentEra, "years");
+
+ int months = GetMonthsInYear(y, CurrentEra);
+ if (m > months) {
+ m = months;
+ }
+
+ int days = GetDaysInMonth(y, m);
+ if (d > days) {
+ d = days;
+ }
+
+ long ticks = ToDateTime(y, m, d, 0, 0, 0, 0).Ticks + (time.Ticks % TicksPerDay);
+ Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime);
+ return (new DateTime(ticks));
+ }
+
+ // 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) {
+ // If we calculate back, the Hebrew day of week for Gregorian 0001/1/1 is Monday (1).
+ // Therfore, the fomula is:
+ return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7));
+ }
+
+ static internal int GetHebrewYearType(int year, int era) {
+ CheckHebrewYearValue(year, era, "year");
+ // The HebrewTable is indexed by Gregorian year and starts from FirstGregorianYear.
+ // So we need to convert year (Hebrew year value) to Gregorian Year below.
+ return (HebrewTable[(year - HebrewYearOf1AD - FirstGregorianTableYear) * 2 + 1]);
+ }
+
+ // 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) {
+ // Get Hebrew year value of the specified time.
+ int year = GetYear(time);
+ DateTime beginOfYearDate;
+ if (year == 5343)
+ {
+ // Gregorian 1583/01/01 corresponds to Hebrew 5343/04/07 (MinSupportedDateTime)
+ // To figure out the Gregorian date associated with Hebrew 5343/01/01, we need to
+ // count the days from 5343/01/01 to 5343/04/07 and subtract that from Gregorian
+ // 1583/01/01.
+ // 1. Tishri (30 days)
+ // 2. Heshvan (30 days since 5343 has 355 days)
+ // 3. Kislev (30 days since 5343 has 355 days)
+ // 96 days to get from 5343/01/01 to 5343/04/07
+ // Gregorian 1583/01/01 - 96 days = 1582/9/27
+
+ // the beginning of Hebrew year 5343 corresponds to Gregorian September 27, 1582.
+ beginOfYearDate = new DateTime(1582, 9, 27);
+ }
+ else
+ {
+ // following line will fail when year is 5343 (first supported year)
+ beginOfYearDate = ToDateTime(year, 1, 1, 0, 0, 0, 0, CurrentEra);
+ }
+ return ((int)((time.Ticks - beginOfYearDate.Ticks) / TicksPerDay) + 1);
+ }
+
+ // Returns the number of days in the month given by the year and
+ // month arguments.
+ //
+
+ public override int GetDaysInMonth(int year, int month, int era) {
+ CheckEraRange(era);
+ int hebrewYearType = GetHebrewYearType(year, era);
+ CheckHebrewMonthValue(year, month, era);
+
+ Contract.Assert(hebrewYearType>= 1 && hebrewYearType <= 6,
+ "hebrewYearType should be from 1 to 6, but now hebrewYearType = " + hebrewYearType + " for hebrew year " + year);
+ int monthDays = LunarMonthLen[hebrewYearType, month];
+ if (monthDays == 0) {
+ throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
+ }
+ return (monthDays);
+ }
+
+ // 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) {
+ CheckEraRange(era);
+ // normal years : 1 = 353 days 2 = 354 days 3 = 355 days.
+ // Leap years : 4 = 383 5 384 6 = 385 days.
+
+ // LunarYearType is from 1 to 6
+ int LunarYearType = GetHebrewYearType(year, era);
+ if (LunarYearType < 4) {
+ // common year: LunarYearType = 1, 2, 3
+ return (352 + LunarYearType);
+ }
+ return (382 + (LunarYearType - 3));
+ }
+
+ // Returns the era for the specified DateTime value.
+
+ public override int GetEra(DateTime time) {
+
+ return (HebrewEra);
+ }
+
+
+ public override int[] Eras {
+ get {
+ return (new int[] {HebrewEra});
+ }
+ }
+
+ // 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) {
+ return (IsLeapYear(year, era) ? 13 : 12);
+ }
+
+ // Returns the year part of the specified DateTime. The returned value is an
+ // integer between 1 and 9999.
+ //
+
+ 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) {
+ if (IsLeapMonth(year, month, era)) {
+ // Every day in a leap month is a leap day.
+ CheckHebrewDayValue(year, month, day, era);
+ return (true);
+ } else if (IsLeapYear(year, Calendar.CurrentEra)) {
+ // There is an additional day in the 6th month in the leap year (the extra day is the 30th day in the 6th month),
+ // so we should return true for 6/30 if that's in a leap year.
+ if (month == 6 && day == 30) {
+ return (true);
+ }
+ }
+ CheckHebrewDayValue(year, month, day, era);
+ return (false);
+ }
+
+ // 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.
+ //
+
+
+ public override int GetLeapMonth(int year, int era)
+ {
+ // Year/era values are checked in IsLeapYear().
+ if (IsLeapYear(year, era))
+ {
+ // The 7th month in a leap year is a leap month.
+ return (7);
+ }
+ 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) {
+ // Year/era values are checked in IsLeapYear().
+ bool isLeapYear = IsLeapYear(year, era);
+ CheckHebrewMonthValue(year, month, era);
+ // The 7th month in a leap year is a leap month.
+ if (isLeapYear) {
+ if (month == 7) {
+ return (true);
+ }
+ }
+ 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) {
+ CheckHebrewYearValue(year, era, "year");
+ return (((7 * (long)year + 1) % 19) < 7);
+ }
+
+ // (month1, day1) - (month2, day2)
+ static int GetDayDifference(int lunarYearType, int month1, int day1, int month2, int day2) {
+ if (month1 == month2) {
+ return (day1 - day2);
+ }
+
+ // Make sure that (month1, day1) < (month2, day2)
+ bool swap = (month1 > month2);
+ if (swap) {
+ // (month1, day1) < (month2, day2). Swap the values.
+ // The result will be a negative number.
+ int tempMonth, tempDay;
+ tempMonth = month1; tempDay = day1;
+ month1 = month2; day1 = day2;
+ month2 = tempMonth; day2 = tempDay;
+ }
+
+ // Get the number of days from (month1,day1) to (month1, end of month1)
+ int days = LunarMonthLen[lunarYearType, month1] - day1;
+
+ // Move to next month.
+ month1++;
+
+ // Add up the days.
+ while (month1 < month2) {
+ days += LunarMonthLen[lunarYearType, month1++];
+ }
+ days += day2;
+
+ return (swap ? days : -days);
+ }
+
+ /*=================================HebrewToGregorian==========================
+ **Action: Convert Hebrew date to Gregorian date.
+ **Returns:
+ **Arguments:
+ **Exceptions:
+ ** The algorithm is like this:
+ ** The hebrew year has an offset to the Gregorian year, so we can guess the Gregorian year for
+ ** the specified Hebrew year. That is, GreogrianYear = HebrewYear - FirstHebrewYearOf1AD.
+ **
+ ** From the Gregorian year and HebrewTable, we can get the Hebrew month/day value
+ ** of the Gregorian date January 1st. Let's call this month/day value [hebrewDateForJan1]
+ **
+ ** If the requested Hebrew month/day is less than [hebrewDateForJan1], we know the result
+ ** Gregorian date falls in previous year. So we decrease the Gregorian year value, and
+ ** retrieve the Hebrew month/day value of the Gregorian date january 1st again.
+ **
+ ** Now, we get the answer of the Gregorian year.
+ **
+ ** The next step is to get the number of days between the requested Hebrew month/day
+ ** and [hebrewDateForJan1]. When we get that, we can create the DateTime by adding/subtracting
+ ** the ticks value of the number of days.
+ **
+ ============================================================================*/
+
+
+ static DateTime HebrewToGregorian(int hebrewYear, int hebrewMonth, int hebrewDay, int hour, int minute, int second, int millisecond) {
+ // Get the rough Gregorian year for the specified hebrewYear.
+ //
+ int gregorianYear = hebrewYear - HebrewYearOf1AD;
+
+ __DateBuffer hebrewDateOfJan1 = new __DateBuffer(); // year value is unused.
+ int lunarYearType = GetLunarMonthDay(gregorianYear, hebrewDateOfJan1);
+
+ if ((hebrewMonth == hebrewDateOfJan1.month) && (hebrewDay == hebrewDateOfJan1.day)) {
+ return (new DateTime(gregorianYear, 1, 1, hour, minute, second, millisecond));
+ }
+
+ int days = GetDayDifference(lunarYearType, hebrewMonth, hebrewDay, hebrewDateOfJan1.month, hebrewDateOfJan1.day);
+
+ DateTime gregorianNewYear = new DateTime(gregorianYear, 1, 1);
+ return (new DateTime(gregorianNewYear.Ticks + days * TicksPerDay
+ + TimeToTicks(hour, minute, second, millisecond)));
+ }
+
+ // 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) {
+ CheckHebrewYearValue(year, era, "year");
+ CheckHebrewMonthValue(year, month, era);
+ CheckHebrewDayValue(year, month, day, era);
+ DateTime dt = HebrewToGregorian(year, month, day, hour, minute, second, millisecond);
+ CheckTicksRange(dt.Ticks);
+ return (dt);
+ }
+
+ private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 5790;
+
+
+ public override int TwoDigitYearMax {
+ get {
+ if (twoDigitYearMax == -1) {
+ twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX);
+ }
+ return (twoDigitYearMax);
+ }
+
+ set {
+ VerifyWritable();
+ if (value == 99)
+ {
+ // Do nothing here. Year 99 is allowed so that TwoDitYearMax is disabled.
+ }
+ else
+ {
+ CheckHebrewYearValue(value, HebrewEra, "value");
+ }
+ 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 > MaxHebrewYear || year < MinHebrewYear) {
+ throw new ArgumentOutOfRangeException(
+ "year",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ Environment.GetResourceString("ArgumentOutOfRange_Range"),
+ MinHebrewYear,
+ MaxHebrewYear));
+ }
+ return (year);
+ }
+
+ internal class __DateBuffer {
+ internal int year;
+ internal int month;
+ internal int day;
+ }
+
+ }
+
+}
+