Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / clr / src / BCL / System / Globalization / PersianCalendar.cs / 1 / PersianCalendar.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System.Globalization {
using System;
////////////////////////////////////////////////////////////////////////////
//
// Notes about PersianCalendar
//
////////////////////////////////////////////////////////////////////////////
/*
** Calendar support range:
** Calendar Minimum Maximum
** ========== ========== ==========
** Gregorian 0622/03/21 9999/12/31
** Persian 0001/01/01 9378/10/10
*/
[Serializable]
public class PersianCalendar : Calendar {
public static readonly int PersianEra = 1;
internal const int DateCycle = 33;
internal const int DatePartYear = 0;
internal const int DatePartDayOfYear = 1;
internal const int DatePartMonth = 2;
internal const int DatePartDay = 3;
internal static int[] DaysToMonth = {0,31,62,93,124,155,186,216,246,276,306,336};
//Leap years, if Y%33 is 1,5,9,13,17,22,26,30
internal static int[] LeapYears33 = {0,1,0,0,0, // 0 [1] 2 3 4
1,0,0,0,1, // [5] 6 7 8 [9]
0,0,0,1,0, // 10 11 12 [13] 14
0,0,1,0,0, // 15 16 [17] 18 19
0,0,1,0,0, // 20 21 [22] 23 24
0,1,0,0,0, // 25 [26] 27 28 29
1,0,0}; //[30] 31 32
internal const int LeapYearsPerCycle = 8;
internal const long GregorianOffset = 226894; //GregorianCalendar.GetAbsoluteDate(622, 3, 21);
internal const long DaysPerCycle = DateCycle * 365 + LeapYearsPerCycle;
//internal static Calendar m_defaultInstance;
// DateTime.MaxValue = Persian calendar (year:9378, month: 10, day: 10).
internal const int MaxCalendarYear = 9378;
internal const int MaxCalendarMonth = 10;
internal const int MaxCalendarDay = 10;
// Persian calendar (year: 1, month: 1, day:1 ) = Gregorian (year: 622, month: 3, day: 21)
// This is the minimal Gregorian date that we support in the PersianCalendar.
internal static DateTime minDate = new DateTime(622, 3, 21);
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)
{
return DaysUpToPersianYear(year) + DaysToMonth[month-1] + day - 1;
}
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
/*=================================DaysUpToPersianYear==========================
**Action: Gets the total number of days (absolute date) up to the given Persian Year.
** The absolute date means the number of days from January 1st, 1 A.D.
**Returns: Gets the total number of days (absolute date) up to the given Persian Year.
**Arguments: PersianYear year value in Persian calendar.
**Exceptions: None
**Notes:
============================================================================*/
long DaysUpToPersianYear(int PersianYear) {
long NumDays; // number of absolute days
int NumCycles; // number of 33 year cycles
int NumYearsLeft; // number of years into 33 year cycle
//
// Compute the number of 33 years cycles.
//
NumCycles = (PersianYear - 1) / DateCycle;
//
// Compute the number of years left. This is the number of years
// into the 33 year cycle for the given year.
//
NumYearsLeft = (PersianYear-1) % DateCycle;
//
// Compute the number of absolute days up to the given year.
//
NumDays = NumCycles * DaysPerCycle + GregorianOffset;
while (NumYearsLeft > 0) {
NumDays += 365;
// Common year is 365 days, and leap year is 366 days.
if(IsLeapYear(NumYearsLeft, CurrentEra)) {
NumDays++;
}
NumYearsLeft--;
}
//
// Return the number of absolute days.
//
return (NumDays);
}
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));
}
}
internal void CheckEraRange(int era) {
if (era != CurrentEra && era != PersianEra) {
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
}
internal void CheckYearRange(int year, int era) {
CheckEraRange(era);
if (year < 1 || year > MaxCalendarYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarYear));
}
}
internal 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,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarMonth));
}
}
if (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
}
}
/*=================================GetDatePart==========================
**Action: Returns a given date part of this DateTime. This method is used
** to compute the year, day-of-year, month, or day part.
**Returns:
**Arguments:
**Exceptions: ArgumentException if part is incorrect.
**Notes:
** First, we get the absolute date (the number of days from January 1st, 1 A.C) for the given ticks.
** Use the formula (((AbsoluteDate - 226894) * 33) / (33 * 365 + 8)) + 1, we can a rough value for the Persian year.
** In order to get the exact Persian year, we compare the exact absolute date for PersianYear and (PersianYear + 1).
** From here, we can get the correct Persian year.
============================================================================*/
internal int GetDatePart(long ticks, int part) {
int PersianYear; // Persian year
int PersianMonth; // Persian month
int PersianDay; // Persian day
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 from this magic formula.
//
PersianYear = (int)(((NumDays - GregorianOffset) * DateCycle) / DaysPerCycle) + 1;
long daysToPersianYear = DaysUpToPersianYear(PersianYear); // The absoulte date for PersianYear
long daysOfPersianYear = GetDaysInYear(PersianYear, CurrentEra); // The number of days for (PersianYear+1) year.
if (NumDays < daysToPersianYear) {
daysToPersianYear -= daysOfPersianYear;
PersianYear--;
} else if (NumDays == daysToPersianYear) {
PersianYear--;
daysToPersianYear -= GetDaysInYear(PersianYear, CurrentEra);
} else {
if (NumDays > daysToPersianYear + daysOfPersianYear) {
daysToPersianYear += daysOfPersianYear;
PersianYear++;
}
}
if (part == DatePartYear) {
return (PersianYear);
}
//
// Calculate the Persian Month.
//
NumDays -= daysToPersianYear;
if (part == DatePartDayOfYear) {
return ((int)NumDays);
}
PersianMonth = 0;
while ((PersianMonth < 12) && (NumDays > DaysToMonth[PersianMonth]))
{
PersianMonth++;
}
if (part == DatePartMonth) {
return (PersianMonth);
}
//
// Calculate the Persian Day.
//
PersianDay = (int)(NumDays - DaysToMonth[PersianMonth-1]);
if (part == DatePartDay) {
return (PersianDay);
}
// 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(
"months",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
-120000,
120000));
}
// 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;
}
if (month == 12) {
// For the 12th month, leap year has 30 days, and common year has 29 days.
return (IsLeapYear(year, CurrentEra) ? 30 : 29);
}
// Other months first 6 months are 31 and the reset are 30 days.
return ((month > 6) ? 30 : 31);
}
// 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,
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);
return (LeapYears33[year%DateCycle]==1);
}
// 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,
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(
"value",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
99,
MaxCalendarYear));
}
twoDigitYearMax = value;
}
}
public override int ToFourDigitYear(int year) {
if (year < 100) {
return (base.ToFourDigitYear(year));
}
if (year > MaxCalendarYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarYear));
}
return (year);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System.Globalization {
using System;
////////////////////////////////////////////////////////////////////////////
//
// Notes about PersianCalendar
//
////////////////////////////////////////////////////////////////////////////
/*
** Calendar support range:
** Calendar Minimum Maximum
** ========== ========== ==========
** Gregorian 0622/03/21 9999/12/31
** Persian 0001/01/01 9378/10/10
*/
[Serializable]
public class PersianCalendar : Calendar {
public static readonly int PersianEra = 1;
internal const int DateCycle = 33;
internal const int DatePartYear = 0;
internal const int DatePartDayOfYear = 1;
internal const int DatePartMonth = 2;
internal const int DatePartDay = 3;
internal static int[] DaysToMonth = {0,31,62,93,124,155,186,216,246,276,306,336};
//Leap years, if Y%33 is 1,5,9,13,17,22,26,30
internal static int[] LeapYears33 = {0,1,0,0,0, // 0 [1] 2 3 4
1,0,0,0,1, // [5] 6 7 8 [9]
0,0,0,1,0, // 10 11 12 [13] 14
0,0,1,0,0, // 15 16 [17] 18 19
0,0,1,0,0, // 20 21 [22] 23 24
0,1,0,0,0, // 25 [26] 27 28 29
1,0,0}; //[30] 31 32
internal const int LeapYearsPerCycle = 8;
internal const long GregorianOffset = 226894; //GregorianCalendar.GetAbsoluteDate(622, 3, 21);
internal const long DaysPerCycle = DateCycle * 365 + LeapYearsPerCycle;
//internal static Calendar m_defaultInstance;
// DateTime.MaxValue = Persian calendar (year:9378, month: 10, day: 10).
internal const int MaxCalendarYear = 9378;
internal const int MaxCalendarMonth = 10;
internal const int MaxCalendarDay = 10;
// Persian calendar (year: 1, month: 1, day:1 ) = Gregorian (year: 622, month: 3, day: 21)
// This is the minimal Gregorian date that we support in the PersianCalendar.
internal static DateTime minDate = new DateTime(622, 3, 21);
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)
{
return DaysUpToPersianYear(year) + DaysToMonth[month-1] + day - 1;
}
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
/*=================================DaysUpToPersianYear==========================
**Action: Gets the total number of days (absolute date) up to the given Persian Year.
** The absolute date means the number of days from January 1st, 1 A.D.
**Returns: Gets the total number of days (absolute date) up to the given Persian Year.
**Arguments: PersianYear year value in Persian calendar.
**Exceptions: None
**Notes:
============================================================================*/
long DaysUpToPersianYear(int PersianYear) {
long NumDays; // number of absolute days
int NumCycles; // number of 33 year cycles
int NumYearsLeft; // number of years into 33 year cycle
//
// Compute the number of 33 years cycles.
//
NumCycles = (PersianYear - 1) / DateCycle;
//
// Compute the number of years left. This is the number of years
// into the 33 year cycle for the given year.
//
NumYearsLeft = (PersianYear-1) % DateCycle;
//
// Compute the number of absolute days up to the given year.
//
NumDays = NumCycles * DaysPerCycle + GregorianOffset;
while (NumYearsLeft > 0) {
NumDays += 365;
// Common year is 365 days, and leap year is 366 days.
if(IsLeapYear(NumYearsLeft, CurrentEra)) {
NumDays++;
}
NumYearsLeft--;
}
//
// Return the number of absolute days.
//
return (NumDays);
}
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));
}
}
internal void CheckEraRange(int era) {
if (era != CurrentEra && era != PersianEra) {
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
}
internal void CheckYearRange(int year, int era) {
CheckEraRange(era);
if (year < 1 || year > MaxCalendarYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarYear));
}
}
internal 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,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarMonth));
}
}
if (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
}
}
/*=================================GetDatePart==========================
**Action: Returns a given date part of this DateTime. This method is used
** to compute the year, day-of-year, month, or day part.
**Returns:
**Arguments:
**Exceptions: ArgumentException if part is incorrect.
**Notes:
** First, we get the absolute date (the number of days from January 1st, 1 A.C) for the given ticks.
** Use the formula (((AbsoluteDate - 226894) * 33) / (33 * 365 + 8)) + 1, we can a rough value for the Persian year.
** In order to get the exact Persian year, we compare the exact absolute date for PersianYear and (PersianYear + 1).
** From here, we can get the correct Persian year.
============================================================================*/
internal int GetDatePart(long ticks, int part) {
int PersianYear; // Persian year
int PersianMonth; // Persian month
int PersianDay; // Persian day
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 from this magic formula.
//
PersianYear = (int)(((NumDays - GregorianOffset) * DateCycle) / DaysPerCycle) + 1;
long daysToPersianYear = DaysUpToPersianYear(PersianYear); // The absoulte date for PersianYear
long daysOfPersianYear = GetDaysInYear(PersianYear, CurrentEra); // The number of days for (PersianYear+1) year.
if (NumDays < daysToPersianYear) {
daysToPersianYear -= daysOfPersianYear;
PersianYear--;
} else if (NumDays == daysToPersianYear) {
PersianYear--;
daysToPersianYear -= GetDaysInYear(PersianYear, CurrentEra);
} else {
if (NumDays > daysToPersianYear + daysOfPersianYear) {
daysToPersianYear += daysOfPersianYear;
PersianYear++;
}
}
if (part == DatePartYear) {
return (PersianYear);
}
//
// Calculate the Persian Month.
//
NumDays -= daysToPersianYear;
if (part == DatePartDayOfYear) {
return ((int)NumDays);
}
PersianMonth = 0;
while ((PersianMonth < 12) && (NumDays > DaysToMonth[PersianMonth]))
{
PersianMonth++;
}
if (part == DatePartMonth) {
return (PersianMonth);
}
//
// Calculate the Persian Day.
//
PersianDay = (int)(NumDays - DaysToMonth[PersianMonth-1]);
if (part == DatePartDay) {
return (PersianDay);
}
// 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(
"months",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
-120000,
120000));
}
// 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;
}
if (month == 12) {
// For the 12th month, leap year has 30 days, and common year has 29 days.
return (IsLeapYear(year, CurrentEra) ? 30 : 29);
}
// Other months first 6 months are 31 and the reset are 30 days.
return ((month > 6) ? 30 : 31);
}
// 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,
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);
return (LeapYears33[year%DateCycle]==1);
}
// 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,
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(
"value",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
99,
MaxCalendarYear));
}
twoDigitYearMax = value;
}
}
public override int ToFourDigitYear(int year) {
if (year < 100) {
return (base.ToFourDigitYear(year));
}
if (year > MaxCalendarYear) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
MaxCalendarYear));
}
return (year);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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