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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.
+
+using System;
+using System.Diagnostics.Contracts;
+
+namespace System.Globalization
+{
+ ////////////////////////////////////////////////////////////////////////////
+ //
+ // Notes about PersianCalendar
+ //
+ ////////////////////////////////////////////////////////////////////////////
+ // Modern Persian calendar is a solar observation based calendar. Each new year begins on the day when the vernal equinox occurs before noon.
+ // The epoch is the date of the vernal equinox prior to the epoch of the Islamic calendar (March 19, 622 Julian or March 22, 622 Gregorian)
+
+ // There is no Persian year 0. Ordinary years have 365 days. Leap years have 366 days with the last month (Esfand) gaining the extra day.
+ /*
+ ** Calendar support range:
+ ** Calendar Minimum Maximum
+ ** ========== ========== ==========
+ ** Gregorian 0622/03/22 9999/12/31
+ ** Persian 0001/01/01 9378/10/13
+ */
+
+ [Serializable]
+ public class PersianCalendar : Calendar
+ {
+ public static readonly int PersianEra = 1;
+
+ internal static long PersianEpoch = new DateTime(622, 3, 22).Ticks / GregorianCalendar.TicksPerDay;
+ private const int ApproximateHalfYear = 180;
+
+ internal const int DatePartYear = 0;
+ internal const int DatePartDayOfYear = 1;
+ internal const int DatePartMonth = 2;
+ internal const int DatePartDay = 3;
+ internal const int MonthsPerYear = 12;
+
+ internal static int[] DaysToMonth = { 0, 31, 62, 93, 124, 155, 186, 216, 246, 276, 306, 336, 366 };
+
+ internal const int MaxCalendarYear = 9378;
+ internal const int MaxCalendarMonth = 10;
+ internal const int MaxCalendarDay = 13;
+
+ // Persian calendar (year: 1, month: 1, day:1 ) = Gregorian (year: 622, month: 3, day: 22)
+ // This is the minimal Gregorian date that we support in the PersianCalendar.
+ internal static DateTime minDate = new DateTime(622, 3, 22);
+ internal static DateTime maxDate = DateTime.MaxValue;
+
+ public override DateTime MinSupportedDateTime
+ {
+ get
+ {
+ return (minDate);
+ }
+ }
+
+ public override DateTime MaxSupportedDateTime
+ {
+ get
+ {
+ return (maxDate);
+ }
+ }
+
+ // Return the type of the Persian calendar.
+ //
+
+
+ //public override CalendarAlgorithmType AlgorithmType {
+ // get {
+ // return CalendarAlgorithmType.SolarCalendar;
+ // }
+ //}
+
+ // Construct an instance of Persian calendar.
+
+ public PersianCalendar()
+ {
+ }
+
+
+ internal override CalendarId BaseCalendarID
+ {
+ get
+ {
+ return CalendarId.GREGORIAN;
+ }
+ }
+
+ internal override CalendarId ID
+ {
+ get
+ {
+ return CalendarId.PERSIAN;
+ }
+ }
+
+
+ /*=================================GetAbsoluteDatePersian==========================
+ **Action: Gets the Absolute date for the given Persian date. The absolute date means
+ ** the number of days from January 1st, 1 A.D.
+ **Returns:
+ **Arguments:
+ **Exceptions:
+ ============================================================================*/
+
+ private long GetAbsoluteDatePersian(int year, int month, int day)
+ {
+ if (year >= 1 && year <= MaxCalendarYear && month >= 1 && month <= 12)
+ {
+ int ordinalDay = DaysInPreviousMonths(month) + day - 1; // day is one based, make 0 based since this will be the number of days we add to beginning of year below
+ int approximateDaysFromEpochForYearStart = (int)(CalendricalCalculationsHelper.MeanTropicalYearInDays * (year - 1));
+ long yearStart = CalendricalCalculationsHelper.PersianNewYearOnOrBefore(PersianEpoch + approximateDaysFromEpochForYearStart + ApproximateHalfYear);
+ yearStart += ordinalDay;
+ return yearStart;
+ }
+ throw new ArgumentOutOfRangeException(null, SR.ArgumentOutOfRange_BadYearMonthDay);
+ }
+
+ internal static void CheckTicksRange(long ticks)
+ {
+ if (ticks < minDate.Ticks || ticks > maxDate.Ticks)
+ {
+ throw new ArgumentOutOfRangeException(
+ "time",
+ String.Format(
+ CultureInfo.InvariantCulture,
+ SR.ArgumentOutOfRange_CalendarRange,
+ minDate,
+ maxDate));
+ }
+ }
+
+ internal static void CheckEraRange(int era)
+ {
+ if (era != CurrentEra && era != PersianEra)
+ {
+ throw new ArgumentOutOfRangeException("era", SR.ArgumentOutOfRange_InvalidEraValue);
+ }
+ }
+
+ internal static void CheckYearRange(int year, int era)
+ {
+ CheckEraRange(era);
+ if (year < 1 || year > MaxCalendarYear)
+ {
+ throw new ArgumentOutOfRangeException(
+ "year",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 1,
+ MaxCalendarYear));
+ }
+ }
+
+ internal static 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,
+ SR.ArgumentOutOfRange_Range,
+ 1,
+ MaxCalendarMonth));
+ }
+ }
+
+ if (month < 1 || month > 12)
+ {
+ throw new ArgumentOutOfRangeException("month", SR.ArgumentOutOfRange_Month);
+ }
+ }
+
+ private static int MonthFromOrdinalDay(int ordinalDay)
+ {
+ Contract.Assert(ordinalDay <= 366);
+ int index = 0;
+ while (ordinalDay > DaysToMonth[index])
+ index++;
+
+ return index;
+ }
+
+ private static int DaysInPreviousMonths(int month)
+ {
+ Contract.Assert(1 <= month && month <= 12);
+ --month; // months are one based but for calculations use 0 based
+ return DaysToMonth[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.
+ ============================================================================*/
+
+ internal int GetDatePart(long ticks, int part)
+ {
+ 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;
+
+ //
+ // Calculate the appromixate Persian Year.
+ //
+
+ long yearStart = CalendricalCalculationsHelper.PersianNewYearOnOrBefore(NumDays);
+ int y = (int)(Math.Floor(((yearStart - PersianEpoch) / CalendricalCalculationsHelper.MeanTropicalYearInDays) + 0.5)) + 1;
+ Contract.Assert(y >= 1);
+
+ if (part == DatePartYear)
+ {
+ return y;
+ }
+
+ //
+ // Calculate the Persian Month.
+ //
+
+ int ordinalDay = (int)(NumDays - CalendricalCalculationsHelper.GetNumberOfDays(this.ToDateTime(y, 1, 1, 0, 0, 0, 0, 1)));
+
+ if (part == DatePartDayOfYear)
+ {
+ return ordinalDay;
+ }
+
+ int m = MonthFromOrdinalDay(ordinalDay);
+ Contract.Assert(ordinalDay >= 1);
+ Contract.Assert(m >= 1 && m <= 12);
+ if (part == DatePartMonth)
+ {
+ return m;
+ }
+
+ int d = ordinalDay - DaysInPreviousMonths(m);
+ Contract.Assert(1 <= d);
+ Contract.Assert(d <= 31);
+
+ //
+ // Calculate the Persian Day.
+ //
+
+ if (part == DatePartDay)
+ {
+ return (d);
+ }
+
+ // Incorrect part value.
+ throw new InvalidOperationException(SR.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,
+ SR.ArgumentOutOfRange_Range,
+ -120000,
+ 120000));
+ }
+ Contract.EndContractBlock();
+ // Get the date in Persian 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 = GetAbsoluteDatePersian(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.
+ //
+
+
+ public override int GetDaysInMonth(int year, int month, int era)
+ {
+ CheckYearMonthRange(year, month, era);
+
+ if ((month == MaxCalendarMonth) && (year == MaxCalendarYear))
+ {
+ return MaxCalendarDay;
+ }
+
+ int daysInMonth = DaysToMonth[month] - DaysToMonth[month - 1];
+ if ((month == MonthsPerYear) && !IsLeapYear(year))
+ {
+ Contract.Assert(daysInMonth == 30);
+ --daysInMonth;
+ }
+ return daysInMonth;
+ }
+
+ // 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);
+ if (year == MaxCalendarYear)
+ {
+ return DaysToMonth[MaxCalendarMonth - 1] + MaxCalendarDay;
+ }
+ // Common years have 365 days. Leap years have 366 days.
+ return (IsLeapYear(year, CurrentEra) ? 366 : 365);
+ }
+
+ // Returns the era for the specified DateTime value.
+
+
+ public override int GetEra(DateTime time)
+ {
+ CheckTicksRange(time.Ticks);
+ return (PersianEra);
+ }
+
+
+
+ public override int[] Eras
+ {
+ get
+ {
+ return (new int[] { PersianEra });
+ }
+ }
+
+ // 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);
+ if (year == MaxCalendarYear)
+ {
+ return MaxCalendarMonth;
+ }
+ 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,
+ SR.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.
+ //
+
+
+ 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);
+
+ if (year == MaxCalendarYear)
+ {
+ return false;
+ }
+
+ return (GetAbsoluteDatePersian(year + 1, 1, 1) - GetAbsoluteDatePersian(year, 1, 1)) == 366;
+ }
+
+ // 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,
+ SR.ArgumentOutOfRange_Day,
+ daysInMonth,
+ month));
+ }
+
+ long lDate = GetAbsoluteDatePersian(year, month, day);
+
+ if (lDate >= 0)
+ {
+ return (new DateTime(lDate * GregorianCalendar.TicksPerDay + TimeToTicks(hour, minute, second, millisecond)));
+ }
+ else
+ {
+ throw new ArgumentOutOfRangeException(null, SR.ArgumentOutOfRange_BadYearMonthDay);
+ }
+ }
+
+ private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 1410;
+
+ 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,
+ SR.ArgumentOutOfRange_Range,
+ 99,
+ MaxCalendarYear));
+ }
+ twoDigitYearMax = value;
+ }
+ }
+
+
+
+ public override int ToFourDigitYear(int year)
+ {
+ if (year < 0)
+ {
+ throw new ArgumentOutOfRangeException("year",
+ SR.ArgumentOutOfRange_NeedNonNegNum);
+ }
+ Contract.EndContractBlock();
+
+ if (year < 100)
+ {
+ return (base.ToFourDigitYear(year));
+ }
+
+ if (year > MaxCalendarYear)
+ {
+ throw new ArgumentOutOfRangeException(
+ "year",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 1,
+ MaxCalendarYear));
+ }
+ return (year);
+ }
+ }
+}