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PersianCalendar Class

Note: This class is new in the .NET Framework version 2.0.

Represents the Persian calendar.

Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)

[SerializableAttribute] 
public class PersianCalendar : Calendar
/** @attribute SerializableAttribute() */ 
public class PersianCalendar extends Calendar
SerializableAttribute 
public class PersianCalendar extends Calendar

The Persian calendar is used in most countries where Persian is spoken, although some regions use different month names. The Persian calendar is the official calendar of Iran and Afghanistan, and is one of the alternative calendars in regions such as Kazakhstan and Tajikistan.

Dates in the Persian calendar start from the year of the Hijra, which corresponds to 622 C.E. and is the year when Muhammad migrated from Mecca to Medina. For example, the date March 21, 2002 C.E. corresponds to the first day of the month of Farvardeen in the year 1381 Anno Persico.

The Persian calendar is based on a solar year and is approximately 365 days long. A year cycles through four seasons, and a new year begins when the sun appears to cross the equator from the southern hemisphere to the northern hemisphere as viewed from the center of the Earth. The new year marks the first day of the month of Farvardeen, which is the first day of spring in the northern hemisphere.

Each of the first six months in the Persian calendar has 31 days, each of the next five months has 30 days, and the last month has 29 days in a common year and 30 days in a leap year. A leap year is a year that, when divided by 33, has a remainder of 1, 5, 9, 13, 17, 22, 26, or 30. For example, the year 1370 is a leap year because dividing it by 33 yields a remainder of 17. There are approximately 8 leap years in every 33-year cycle.

Using the PersianCalendar

Use a PersianCalendar object to calculate dates in the Persian calendar, or to convert Persian dates to and from Gregorian dates.

Do not use a PersianCalendar object as the default calendar for a culture. The default calendar is specified by the CultureInfo.Calendar property, and must be one of the calendars returned by the CultureInfo.OptionalCalendars property. Currently, the PersianCalendar class is not an optional calendar for any culture supported by the CultureInfo class and consequently cannot be a default calendar.

The following code example demonstrates the field, property, and method members of the PersianCalendar class.

// This example demonstrates the members of the PersianCalendar class.

using System;
using System.Globalization;

class Sample 
{
    public static void Main() 
    {
//--------------------------------------------------------------------------------
// Get today's date.
//--------------------------------------------------------------------------------
    Console.WriteLine("\n................. Today ...........................\n");
    PersianCalendar jc = new PersianCalendar();
    DateTime thisDate = DateTime.Now;

// Use thisDate twice to display the name of the day and the current date.
    Console.WriteLine("Today is {0:dddd}, {0}", thisDate);
//--------------------------------------------------------------------------------
// Fields
//--------------------------------------------------------------------------------
    Console.WriteLine("\n............... Fields .............................\n");
    Console.WriteLine("PersianEra = {0}", PersianCalendar.PersianEra);
//--------------------------------------------------------------------------------
// Properties
//--------------------------------------------------------------------------------
    Console.WriteLine("\n............... Properties .........................\n");
    Console.Write("Eras:");
    foreach (int era in jc.Eras)
        {
        Console.WriteLine(" era = {0}", era);
        }
//--------------------------------------------------------------------------------
    Console.WriteLine("MaxSupportedDateTime = {0:G}", jc.MaxSupportedDateTime);
//--------------------------------------------------------------------------------
    Console.WriteLine("MinSupportedDateTime = {0:G}", jc.MinSupportedDateTime);
//--------------------------------------------------------------------------------
    Console.WriteLine("TwoDigitYearMax = {0}", jc.TwoDigitYearMax);
//--------------------------------------------------------------------------------
// Methods
//--------------------------------------------------------------------------------
    Console.WriteLine("\n................ Methods ...........................\n");

// Create a date six months in the future and another date six months in the past.

    Console.WriteLine("AddMonths: thisDate + 6 months = {0}\n" + 
                      "           thisDate - 6 months = {1}",
                       jc.AddMonths(thisDate, 6), jc.AddMonths(thisDate, -6));
//--------------------------------------------------------------------------------

// Create a date five years in the future and another date three years in the past.

    Console.WriteLine("AddYears:  thisDate + 5 years =  {0}\n" + 
                      "           thisDate - 3 years =  {1}",
                       jc.AddYears(thisDate, 5), jc.AddYears(thisDate, -3));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetDayOfMonth: month = {0}", jc.GetDayOfMonth(thisDate));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetDayOfWeek: day = {0}", jc.GetDayOfWeek(thisDate));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetDayOfYear: day = {0}", jc.GetDayOfYear(thisDate));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetDaysInMonth: days = {0}", 
                      jc.GetDaysInMonth( thisDate.Year, thisDate.Month, 
                      PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetDaysInYear: days = {0}", 
                       jc.GetDaysInYear(thisDate.Year, PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetEra: era = {0}", jc.GetEra(thisDate));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetLeapMonth: leap month (if any) = {0}", 
                       jc.GetLeapMonth(thisDate.Year, PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetMonth: month = {0}", jc.GetMonth(thisDate));
//-------------------------------------------------------------
    Console.WriteLine("GetMonthsInYear: months in a year = {0}", 
                       jc.GetMonthsInYear(thisDate.Year, PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("GetYear: year = {0}", jc.GetYear(thisDate));
//--------------------------------------------------------------------------------
    Console.WriteLine("IsLeapDay: This is a leap day = {0}", 
                       jc.IsLeapDay(thisDate.Year, thisDate.Month, thisDate.Day, 
                       PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("IsLeapMonth: This is a leap month = {0}", 
                       jc.IsLeapMonth(thisDate.Year, thisDate.Month, 
                       PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    Console.WriteLine("IsLeapYear: 1370 is a leap year = {0}", 
                       jc.IsLeapYear(1370, PersianCalendar.PersianEra));
//--------------------------------------------------------------------------------
    DateTime dt1 = new DateTime(thisDate.Year, thisDate.Month, thisDate.Day, 20, 30, 15, 500);
    DateTime dt2 = jc.ToDateTime(thisDate.Year, thisDate.Month, thisDate.Day, 20, 30, 15, 500, 
                                 PersianCalendar.PersianEra);
    Console.WriteLine("ToDateTime:");
    Console.WriteLine("  Gregorian calendar: {0}\n" +
                      "  Persian calendar:   {1}", dt1, dt2);
//--------------------------------------------------------------------------------

// Get the 4-digit year for a year whose last two digits are 99. The 4-digit year 
// depends on the current value of the TwoDigitYearMax property.

    Console.WriteLine("ToFourDigitYear:");
    Console.WriteLine("  If TwoDigitYearMax = {0}, ToFourDigitYear(99) = {1}", 
                       jc.TwoDigitYearMax, jc.ToFourDigitYear(99));
    jc.TwoDigitYearMax = thisDate.Year;
    Console.WriteLine("  If TwoDigitYearMax = {0}, ToFourDigitYear(99) = {1}", 
                       jc.TwoDigitYearMax, jc.ToFourDigitYear(99));
    }
}
/*
This code example produces the following results:

................. Today ...........................

Today is Friday, 8/20/2004 1:08:37 PM

............... Fields .............................

PersianEra = 1

............... Properties .........................

Eras: era = 1
MaxSupportedDateTime = 12/31/9999 11:59:59 PM
MinSupportedDateTime = 3/21/0622 12:00:00 AM
TwoDigitYearMax = 1410

................ Methods ...........................

AddMonths: thisDate + 6 months = 2/18/2005 1:08:37 PM
           thisDate - 6 months = 2/19/2004 1:08:37 PM
AddYears:  thisDate + 5 years =  8/21/2009 1:08:37 PM
           thisDate - 3 years =  8/21/2001 1:08:37 PM
GetDayOfMonth: month = 30
GetDayOfWeek: day = Friday
GetDayOfYear: day = 154
GetDaysInMonth: days = 30
GetDaysInYear: days = 365
GetEra: era = 1
GetLeapMonth: leap month (if any) = 0
GetMonth: month = 5
GetMonthsInYear: months in a year = 12
GetYear: year = 1383
IsLeapDay: This is a leap day = False
IsLeapMonth: This is a leap month = False
IsLeapYear: 1370 is a leap year = True
ToDateTime:
  Gregorian calendar: 8/20/2004 8:30:15 PM
  Persian calendar:   11/11/2625 8:30:15 PM
ToFourDigitYear:
  If TwoDigitYearMax = 1410, ToFourDigitYear(99) = 1399
  If TwoDigitYearMax = 2004, ToFourDigitYear(99) = 1999

*/

System.Object
   System.Globalization.Calendar
    System.Globalization.PersianCalendar

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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