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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.Diagnostics;
- using System.Diagnostics.Contracts;
-
- ////////////////////////////////////////////////////////////////////////////
- //
- // 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;
- 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;
-
- /*=================================GetDefaultInstance==========================
- **Action: Internal method to provide a default intance of PersianCalendar. Used by NLS+ implementation
- ** and other calendars.
- **Returns:
- **Arguments:
- **Exceptions:
- ============================================================================*/
- /*
- internal static Calendar GetDefaultInstance() {
- if (m_defaultInstance == null) {
- m_defaultInstance = new PersianCalendar();
- }
- return (m_defaultInstance);
- }
- */
-
-
-
- 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 int BaseCalendarID {
- get {
- return (CAL_GREGORIAN);
- }
- }
-
- internal override int ID {
- get {
- return (CAL_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:
- ============================================================================*/
-
- 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, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
- }
-
- static internal void CheckTicksRange(long ticks) {
- if (ticks < minDate.Ticks || ticks > maxDate.Ticks) {
- throw new ArgumentOutOfRangeException(
- "time",
- String.Format(
- CultureInfo.InvariantCulture,
- Environment.GetResourceString("ArgumentOutOfRange_CalendarRange"),
- minDate,
- maxDate));
- }
- }
-
- static internal void CheckEraRange(int era) {
- if (era != CurrentEra && era != PersianEra) {
- throw new ArgumentOutOfRangeException(nameof(era), Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
- }
- }
-
- static internal void CheckYearRange(int year, int era) {
- CheckEraRange(era);
- if (year < 1 || year > MaxCalendarYear) {
- throw new ArgumentOutOfRangeException(
- nameof(year),
- String.Format(
- CultureInfo.CurrentCulture,
- Environment.GetResourceString("ArgumentOutOfRange_Range"),
- 1,
- MaxCalendarYear));
- }
- }
-
- static internal void CheckYearMonthRange(int year, int month, int era) {
- CheckYearRange(year, era);
- if (year == MaxCalendarYear) {
- if (month > MaxCalendarMonth) {
- throw new ArgumentOutOfRangeException(
- nameof(month),
- String.Format(
- CultureInfo.CurrentCulture,
- Environment.GetResourceString("ArgumentOutOfRange_Range"),
- 1,
- MaxCalendarMonth));
- }
- }
-
- if (month < 1 || month > 12) {
- throw new ArgumentOutOfRangeException(nameof(month), Environment.GetResourceString("ArgumentOutOfRange_Month"));
- }
- }
-
- static int MonthFromOrdinalDay(int ordinalDay)
- {
- Debug.Assert(ordinalDay <= 366);
- int index = 0;
- while (ordinalDay > DaysToMonth[index])
- index++;
-
- return index;
- }
-
- static int DaysInPreviousMonths(int month)
- {
- Debug.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;
- Debug.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);
- Debug.Assert(ordinalDay >= 1);
- Debug.Assert(m >= 1 && m <= 12);
- if (part == DatePartMonth)
- {
- return m;
- }
-
- int d = ordinalDay - DaysInPreviousMonths(m);
- Debug.Assert(1 <= d);
- Debug.Assert(d <= 31);
-
- //
- // Calculate the Persian Day.
- //
-
- if (part == DatePartDay)
- {
- return (d);
- }
-
- // 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(
- nameof(months),
- String.Format(
- CultureInfo.CurrentCulture,
- Environment.GetResourceString("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))
- {
- Debug.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(
- nameof(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.
- //
-
-
- 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(
- nameof(day),
- String.Format(
- CultureInfo.CurrentCulture,
- Environment.GetResourceString("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, Environment.GetResourceString("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(
- nameof(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(nameof(year),
- Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
- }
- Contract.EndContractBlock();
-
- if (year < 100) {
- return (base.ToFourDigitYear(year));
- }
-
- if (year > MaxCalendarYear) {
- throw new ArgumentOutOfRangeException(
- nameof(year),
- String.Format(
- CultureInfo.CurrentCulture,
- Environment.GetResourceString("ArgumentOutOfRange_Range"),
- 1,
- MaxCalendarYear));
- }
- return (year);
- }
- }
-}