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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System.Globalization {
//
// N.B.:
// A lot of this code is directly from DateTime.cs. If you update that class,
// update this one as well.
// However, we still need these duplicated code because we will add era support
// in this class.
//
//
using System.Threading;
using System;
using System.Globalization;
using System.Runtime.Serialization;
using System.Diagnostics.Contracts;
// This calendar recognizes two era values:
// 0 CurrentEra (AD)
// 1 BeforeCurrentEra (BC)
[System.Runtime.InteropServices.ComVisible(true)]
[Serializable]
public class GregorianCalendar : Calendar
{
/*
A.D. = anno Domini
*/
public const int ADEra = 1;
internal const int DatePartYear = 0;
internal const int DatePartDayOfYear = 1;
internal const int DatePartMonth = 2;
internal const int DatePartDay = 3;
//
// This is the max Gregorian year can be represented by DateTime class. The limitation
// is derived from DateTime class.
//
internal const int MaxYear = 9999;
internal GregorianCalendarTypes m_type;
internal static readonly int[] DaysToMonth365 =
{
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
};
internal static readonly int[] DaysToMonth366 =
{
0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366
};
private static volatile Calendar s_defaultInstance;
#region Serialization
[OnDeserialized]
private void OnDeserialized(StreamingContext ctx)
{
if (m_type < GregorianCalendarTypes.Localized ||
m_type > GregorianCalendarTypes.TransliteratedFrench)
{
throw new SerializationException(
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString(
"Serialization_MemberOutOfRange"),
"type",
"GregorianCalendar"));
}
}
#endregion Serialization
[System.Runtime.InteropServices.ComVisible(false)]
public override DateTime MinSupportedDateTime
{
get
{
return (DateTime.MinValue);
}
}
[System.Runtime.InteropServices.ComVisible(false)]
public override DateTime MaxSupportedDateTime
{
get
{
return (DateTime.MaxValue);
}
}
// Return the type of the Gregorian calendar.
//
[System.Runtime.InteropServices.ComVisible(false)]
public override CalendarAlgorithmType AlgorithmType
{
get
{
return CalendarAlgorithmType.SolarCalendar;
}
}
/*=================================GetDefaultInstance==========================
**Action: Internal method to provide a default intance of GregorianCalendar. Used by NLS+ implementation
** and other calendars.
**Returns:
**Arguments:
**Exceptions:
============================================================================*/
internal static Calendar GetDefaultInstance() {
if (s_defaultInstance == null) {
s_defaultInstance = new GregorianCalendar();
}
return (s_defaultInstance);
}
// Construct an instance of gregorian calendar.
public GregorianCalendar() :
this(GregorianCalendarTypes.Localized) {
}
public GregorianCalendar(GregorianCalendarTypes type) {
if ((int)type < (int)GregorianCalendarTypes.Localized || (int)type > (int)GregorianCalendarTypes.TransliteratedFrench) {
throw new ArgumentOutOfRangeException(
"type",
Environment.GetResourceString("ArgumentOutOfRange_Range",
GregorianCalendarTypes.Localized, GregorianCalendarTypes.TransliteratedFrench));
}
Contract.EndContractBlock();
this.m_type = type;
}
public virtual GregorianCalendarTypes CalendarType {
get {
return (m_type);
}
set {
VerifyWritable();
switch (value) {
case GregorianCalendarTypes.Localized:
case GregorianCalendarTypes.USEnglish:
case GregorianCalendarTypes.MiddleEastFrench:
case GregorianCalendarTypes.Arabic:
case GregorianCalendarTypes.TransliteratedEnglish:
case GregorianCalendarTypes.TransliteratedFrench:
m_type = value;
break;
default:
throw new ArgumentOutOfRangeException("m_type", Environment.GetResourceString("ArgumentOutOfRange_Enum"));
}
}
}
internal override int ID {
get {
// By returning different ID for different variations of GregorianCalendar,
// we can support the Transliterated Gregorian calendar.
// DateTimeFormatInfo will use this ID to get formatting information about
// the calendar.
return ((int)m_type);
}
}
// 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)
{
// n = number of days since 1/1/0001
int n = (int)(ticks / TicksPerDay);
// y400 = number of whole 400-year periods since 1/1/0001
int y400 = n / DaysPer400Years;
// n = day number within 400-year period
n -= y400 * DaysPer400Years;
// y100 = number of whole 100-year periods within 400-year period
int y100 = n / DaysPer100Years;
// Last 100-year period has an extra day, so decrement result if 4
if (y100 == 4) y100 = 3;
// n = day number within 100-year period
n -= y100 * DaysPer100Years;
// y4 = number of whole 4-year periods within 100-year period
int y4 = n / DaysPer4Years;
// n = day number within 4-year period
n -= y4 * DaysPer4Years;
// y1 = number of whole years within 4-year period
int y1 = n / DaysPerYear;
// 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 (y400 * 400 + y100 * 100 + y4 * 4 + y1 + 1);
}
// n = day number within year
n -= y1 * DaysPerYear;
// 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 && (y4 != 24 || y100 == 3));
int[] days = leapYear? DaysToMonth366: 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);
}
/*=================================GetAbsoluteDate==========================
**Action: Gets the absolute date for the given Gregorian date. The absolute date means
** the number of days from January 1st, 1 A.D.
**Returns: the absolute date
**Arguments:
** year the Gregorian year
** month the Gregorian month
** day the day
**Exceptions:
** ArgumentOutOfRangException if year, month, day value is valid.
**Note:
** This is an internal method used by DateToTicks() and the calculations of Hijri and Hebrew calendars.
** Number of Days in Prior Years (both common and leap years) +
** Number of Days in Prior Months of Current Year +
** Number of Days in Current Month
**
============================================================================*/
internal static long GetAbsoluteDate(int year, int month, int day) {
if (year >= 1 && year <= MaxYear && month >= 1 && month <= 12)
{
int[] days = ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))) ? DaysToMonth366: DaysToMonth365;
if (day >= 1 && (day <= days[month] - days[month - 1])) {
int y = year - 1;
int absoluteDate = y * 365 + y / 4 - y / 100 + y / 400 + days[month - 1] + day - 1;
return (absoluteDate);
}
}
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
// Returns the tick count corresponding to the given year, month, and day.
// Will check the if the parameters are valid.
internal virtual long DateToTicks(int year, int month, int day) {
return (GetAbsoluteDate(year, month, day)* TicksPerDay);
}
// 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();
int y, m, d;
time.GetDatePart(out y, out m, out d);
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)) ? DaysToMonth366: 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));
}
// 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 time.Day;
}
// 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 time.DayOfYear;
}
// 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) {
if (era == CurrentEra || era == ADEra) {
if (year < 1 || year > MaxYear) {
throw new ArgumentOutOfRangeException("year", Environment.GetResourceString("ArgumentOutOfRange_Range",
1, MaxYear));
}
if (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
}
int[] days = ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) ? DaysToMonth366: DaysToMonth365);
return (days[month] - days[month - 1]);
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
// 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)
{
if (era == CurrentEra || era == ADEra) {
if (year >= 1 && year <= MaxYear) {
return ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) ? 366:365);
}
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxYear));
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
// Returns the era for the specified DateTime value.
public override int GetEra(DateTime time)
{
return (ADEra);
}
public override int[] Eras {
get {
return (new int[] {ADEra} );
}
}
// 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 time.Month;
}
// Returns the number of months in the specified year and era.
public override int GetMonthsInYear(int year, int era)
{
if (era == CurrentEra || era == ADEra) {
if (year >= 1 && year <= MaxYear)
{
return (12);
}
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxYear));
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
// 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 time.Year;
}
// 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 (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Range",
1, 12));
}
Contract.EndContractBlock();
if (era != CurrentEra && era != ADEra)
{
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
if (year < 1 || year > MaxYear) {
throw new ArgumentOutOfRangeException(
"year",
Environment.GetResourceString("ArgumentOutOfRange_Range", 1, MaxYear));
}
if (day < 1 || day > GetDaysInMonth(year, month)) {
throw new ArgumentOutOfRangeException("day", Environment.GetResourceString("ArgumentOutOfRange_Range",
1, GetDaysInMonth(year, month)));
}
if (!IsLeapYear(year)) {
return (false);
}
if (month == 2 && day == 29) {
return (true);
}
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.
//
[System.Runtime.InteropServices.ComVisible(false)]
public override int GetLeapMonth(int year, int era)
{
if (era != CurrentEra && era != ADEra)
{
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
if (year < 1 || year > MaxYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear));
}
Contract.EndContractBlock();
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)
{
if (era != CurrentEra && era != ADEra) {
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
if (year < 1 || year > MaxYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear));
}
if (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Range",
1, 12));
}
Contract.EndContractBlock();
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) {
if (era == CurrentEra || era == ADEra) {
if (year >= 1 && year <= MaxYear) {
return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
}
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear));
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
// 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)
{
if (era == CurrentEra || era == ADEra) {
return new DateTime(year, month, day, hour, minute, second, millisecond);
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
internal override Boolean TryToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era, out DateTime result) {
if (era == CurrentEra || era == ADEra) {
return DateTime.TryCreate(year, month, day, hour, minute, second, millisecond, out result);
}
result = DateTime.MinValue;
return false;
}
private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 2029;
public override int TwoDigitYearMax
{
get {
if (twoDigitYearMax == -1) {
twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX);
}
return (twoDigitYearMax);
}
set {
VerifyWritable();
if (value < 99 || value > MaxYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
99,
MaxYear));
}
twoDigitYearMax = value;
}
}
public override int ToFourDigitYear(int year) {
if (year < 0) {
throw new ArgumentOutOfRangeException("year",
Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
Contract.EndContractBlock();
if (year > MaxYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear));
}
return (base.ToFourDigitYear(year));
}
}
}
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