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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.Diagnostics.Contracts;
+
+namespace System.Globalization
+{
+ //
+ // This class implements the Julian calendar. In 48 B.C. Julius Caesar ordered a calendar reform, and this calendar
+ // is called Julian calendar. It consisted of a solar year of twelve months and of 365 days with an extra day
+ // every fourth year.
+ //*
+ //* Calendar support range:
+ //* Calendar Minimum Maximum
+ //* ========== ========== ==========
+ //* Gregorian 0001/01/01 9999/12/31
+ //* Julia 0001/01/03 9999/10/19
+
+ [Serializable]
+ public class JulianCalendar : Calendar
+ {
+ public static readonly int JulianEra = 1;
+
+ private const int DatePartYear = 0;
+ private const int DatePartDayOfYear = 1;
+ private const int DatePartMonth = 2;
+ private const int DatePartDay = 3;
+
+ // Number of days in a non-leap year
+ private const int JulianDaysPerYear = 365;
+ // Number of days in 4 years
+ private const int JulianDaysPer4Years = JulianDaysPerYear * 4 + 1;
+
+ private static readonly int[] s_daysToMonth365 =
+ {
+ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
+ };
+
+ private static readonly int[] s_daysToMonth366 =
+ {
+ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366
+ };
+
+ // Gregorian Calendar 9999/12/31 = Julian Calendar 9999/10/19
+ // keep it as variable field for serialization compat.
+ internal int MaxYear = 9999;
+
+
+ public override DateTime MinSupportedDateTime
+ {
+ get
+ {
+ return (DateTime.MinValue);
+ }
+ }
+
+ public override DateTime MaxSupportedDateTime
+ {
+ get
+ {
+ return (DateTime.MaxValue);
+ }
+ }
+
+ public override CalendarAlgorithmType AlgorithmType
+ {
+ get
+ {
+ return CalendarAlgorithmType.SolarCalendar;
+ }
+ }
+
+ public JulianCalendar()
+ {
+ // There is no system setting of TwoDigitYear max, so set the value here.
+ twoDigitYearMax = 2029;
+ }
+
+ internal override CalendarId ID
+ {
+ get
+ {
+ return CalendarId.JULIAN;
+ }
+ }
+
+ internal static void CheckEraRange(int era)
+ {
+ if (era != CurrentEra && era != JulianEra)
+ {
+ throw new ArgumentOutOfRangeException(nameof(era), SR.ArgumentOutOfRange_InvalidEraValue);
+ }
+ }
+
+ internal void CheckYearEraRange(int year, int era)
+ {
+ CheckEraRange(era);
+ if (year <= 0 || year > MaxYear)
+ {
+ throw new ArgumentOutOfRangeException(
+ nameof(year),
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 1,
+ MaxYear));
+ }
+ }
+
+ internal static void CheckMonthRange(int month)
+ {
+ if (month < 1 || month > 12)
+ {
+ throw new ArgumentOutOfRangeException(nameof(month), SR.ArgumentOutOfRange_Month);
+ }
+ }
+
+ /*===================================CheckDayRange============================
+ **Action: Check for if the day value is valid.
+ **Returns:
+ **Arguments:
+ **Exceptions:
+ **Notes:
+ ** Before calling this method, call CheckYearEraRange()/CheckMonthRange() to make
+ ** sure year/month values are correct.
+ ============================================================================*/
+
+ internal static void CheckDayRange(int year, int month, int day)
+ {
+ if (year == 1 && month == 1)
+ {
+ // The mimimum supported Julia date is Julian 0001/01/03.
+ if (day < 3)
+ {
+ throw new ArgumentOutOfRangeException(null,
+ SR.ArgumentOutOfRange_BadYearMonthDay);
+ }
+ }
+ bool isLeapYear = (year % 4) == 0;
+ int[] days = isLeapYear ? s_daysToMonth366 : s_daysToMonth365;
+ int monthDays = days[month] - days[month - 1];
+ if (day < 1 || day > monthDays)
+ {
+ throw new ArgumentOutOfRangeException(
+ nameof(day),
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 1,
+ monthDays));
+ }
+ }
+
+
+ // Returns a given date part of this DateTime. This method is used
+ // to compute the year, day-of-year, month, or day part.
+ internal static int GetDatePart(long ticks, int part)
+ {
+ // Gregorian 1/1/0001 is Julian 1/3/0001. Remember DateTime(0) is refered to Gregorian 1/1/0001.
+ // The following line convert Gregorian ticks to Julian ticks.
+ long julianTicks = ticks + TicksPerDay * 2;
+ // n = number of days since 1/1/0001
+ int n = (int)(julianTicks / TicksPerDay);
+ // y4 = number of whole 4-year periods within 100-year period
+ int y4 = n / JulianDaysPer4Years;
+ // n = day number within 4-year period
+ n -= y4 * JulianDaysPer4Years;
+ // y1 = number of whole years within 4-year period
+ int y1 = n / JulianDaysPerYear;
+ // Last year has an extra day, so decrement result if 4
+ if (y1 == 4) y1 = 3;
+ // If year was requested, compute and return it
+ if (part == DatePartYear)
+ {
+ return (y4 * 4 + y1 + 1);
+ }
+ // n = day number within year
+ n -= y1 * JulianDaysPerYear;
+ // If day-of-year was requested, return it
+ if (part == DatePartDayOfYear)
+ {
+ return (n + 1);
+ }
+ // Leap year calculation looks different from IsLeapYear since y1, y4,
+ // and y100 are relative to year 1, not year 0
+ bool leapYear = (y1 == 3);
+ int[] days = leapYear ? s_daysToMonth366 : s_daysToMonth365;
+ // All months have less than 32 days, so n >> 5 is a good conservative
+ // estimate for the month
+ int m = (n >> 5) + 1;
+ // m = 1-based month number
+ while (n >= days[m]) m++;
+ // If month was requested, return it
+ if (part == DatePartMonth) return (m);
+ // Return 1-based day-of-month
+ return (n - days[m - 1] + 1);
+ }
+
+ // Returns the tick count corresponding to the given year, month, and day.
+ internal static long DateToTicks(int year, int month, int day)
+ {
+ int[] days = (year % 4 == 0) ? s_daysToMonth366 : s_daysToMonth365;
+ int y = year - 1;
+ int n = y * 365 + y / 4 + days[month - 1] + day - 1;
+ // Gregorian 1/1/0001 is Julian 1/3/0001. n * TicksPerDay is the ticks in JulianCalendar.
+ // Therefore, we subtract two days in the following to convert the ticks in JulianCalendar
+ // to ticks in Gregorian calendar.
+ return ((n - 2) * TicksPerDay);
+ }
+
+
+ public override DateTime AddMonths(DateTime time, int months)
+ {
+ if (months < -120000 || months > 120000)
+ {
+ throw new ArgumentOutOfRangeException(
+ nameof(months),
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ -120000,
+ 120000));
+ }
+ Contract.EndContractBlock();
+ 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[] daysArray = (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0)) ? s_daysToMonth366 : s_daysToMonth365;
+ int days = (daysArray[m] - daysArray[m - 1]);
+
+ if (d > days)
+ {
+ d = days;
+ }
+ long ticks = DateToTicks(y, m, d) + time.Ticks % TicksPerDay;
+ Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime);
+ return (new DateTime(ticks));
+ }
+
+
+ public override DateTime AddYears(DateTime time, int years)
+ {
+ return (AddMonths(time, years * 12));
+ }
+
+
+ public override int GetDayOfMonth(DateTime time)
+ {
+ return (GetDatePart(time.Ticks, DatePartDay));
+ }
+
+
+ public override DayOfWeek GetDayOfWeek(DateTime time)
+ {
+ return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7));
+ }
+
+
+ public override int GetDayOfYear(DateTime time)
+ {
+ return (GetDatePart(time.Ticks, DatePartDayOfYear));
+ }
+
+
+ public override int GetDaysInMonth(int year, int month, int era)
+ {
+ CheckYearEraRange(year, era);
+ CheckMonthRange(month);
+ int[] days = (year % 4 == 0) ? s_daysToMonth366 : s_daysToMonth365;
+ return (days[month] - days[month - 1]);
+ }
+
+
+ public override int GetDaysInYear(int year, int era)
+ {
+ // Year/Era range is done in IsLeapYear().
+ return (IsLeapYear(year, era) ? 366 : 365);
+ }
+
+
+ public override int GetEra(DateTime time)
+ {
+ return (JulianEra);
+ }
+
+
+ public override int GetMonth(DateTime time)
+ {
+ return (GetDatePart(time.Ticks, DatePartMonth));
+ }
+
+
+ public override int[] Eras
+ {
+ get
+ {
+ return (new int[] { JulianEra });
+ }
+ }
+
+
+ public override int GetMonthsInYear(int year, int era)
+ {
+ CheckYearEraRange(year, era);
+ return (12);
+ }
+
+
+ public override int GetYear(DateTime time)
+ {
+ return (GetDatePart(time.Ticks, DatePartYear));
+ }
+
+
+ public override bool IsLeapDay(int year, int month, int day, int era)
+ {
+ CheckMonthRange(month);
+ // Year/Era range check is done in IsLeapYear().
+ if (IsLeapYear(year, era))
+ {
+ CheckDayRange(year, month, day);
+ return (month == 2 && day == 29);
+ }
+ CheckDayRange(year, month, day);
+ 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)
+ {
+ CheckYearEraRange(year, era);
+ return (0);
+ }
+
+
+ public override bool IsLeapMonth(int year, int month, int era)
+ {
+ CheckYearEraRange(year, era);
+ CheckMonthRange(month);
+ 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)
+ {
+ CheckYearEraRange(year, era);
+ return (year % 4 == 0);
+ }
+
+
+ public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era)
+ {
+ CheckYearEraRange(year, era);
+ CheckMonthRange(month);
+ CheckDayRange(year, month, day);
+ if (millisecond < 0 || millisecond >= MillisPerSecond)
+ {
+ throw new ArgumentOutOfRangeException(
+ nameof(millisecond),
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 0,
+ MillisPerSecond - 1));
+ }
+
+ if (hour >= 0 && hour < 24 && minute >= 0 && minute < 60 && second >= 0 && second < 60)
+ {
+ return new DateTime(DateToTicks(year, month, day) + (new TimeSpan(0, hour, minute, second, millisecond)).Ticks);
+ }
+ else
+ {
+ throw new ArgumentOutOfRangeException(null, SR.ArgumentOutOfRange_BadHourMinuteSecond);
+ }
+ }
+
+
+ public override int TwoDigitYearMax
+ {
+ get
+ {
+ return (twoDigitYearMax);
+ }
+
+ set
+ {
+ VerifyWritable();
+ if (value < 99 || value > MaxYear)
+ {
+ throw new ArgumentOutOfRangeException(
+ "year",
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Range,
+ 99,
+ MaxYear));
+ }
+ twoDigitYearMax = value;
+ }
+ }
+
+
+ public override int ToFourDigitYear(int year)
+ {
+ if (year < 0)
+ {
+ throw new ArgumentOutOfRangeException(nameof(year),
+ SR.ArgumentOutOfRange_NeedNonNegNum);
+ }
+ Contract.EndContractBlock();
+
+ if (year > MaxYear)
+ {
+ throw new ArgumentOutOfRangeException(
+ nameof(year),
+ String.Format(
+ CultureInfo.CurrentCulture,
+ SR.ArgumentOutOfRange_Bounds_Lower_Upper,
+ 1,
+ MaxYear));
+ }
+ return (base.ToFourDigitYear(year));
+ }
+ }
+}