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Calendar Class

Represents time in divisions, such as weeks, months, and years.

System.Object
  System.Globalization.Calendar
    More...

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

[SerializableAttribute]
[ComVisibleAttribute(true)]
public abstract class Calendar : ICloneable

The Calendar type exposes the following members.

  NameDescription
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryCalendarInitializes a new instance of the Calendar class.
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  NameDescription
Public propertyAlgorithmTypeGets a value indicating whether the current calendar is solar-based, lunar-based, or a combination of both.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryErasWhen overridden in a derived class, gets the list of eras in the current calendar.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryIsReadOnlyGets a value indicating whether this Calendar object is read-only.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryMaxSupportedDateTimeGets the latest date and time supported by this Calendar object.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryMinSupportedDateTimeGets the earliest date and time supported by this Calendar object.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryTwoDigitYearMaxGets or sets the last year of a 100-year range that can be represented by a 2-digit year.
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddDaysReturns a DateTime that is the specified number of days away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddHoursReturns a DateTime that is the specified number of hours away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddMillisecondsReturns a DateTime that is the specified number of milliseconds away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddMinutesReturns a DateTime that is the specified number of minutes away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddMonthsWhen overridden in a derived class, returns a DateTime that is the specified number of months away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddSecondsReturns a DateTime that is the specified number of seconds away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddWeeksReturns a DateTime that is the specified number of weeks away from the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAddYearsWhen overridden in a derived class, returns a DateTime that is the specified number of years away from the specified DateTime.
Public methodCloneCreates a new object that is a copy of the current Calendar object.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDayOfMonthWhen overridden in a derived class, returns the day of the month in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDayOfWeekWhen overridden in a derived class, returns the day of the week in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDayOfYearWhen overridden in a derived class, returns the day of the year in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDaysInMonth(Int32, Int32)Returns the number of days in the specified month and year of the current era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDaysInMonth(Int32, Int32, Int32)When overridden in a derived class, returns the number of days in the specified month, year, and era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDaysInYear(Int32)Returns the number of days in the specified year of the current era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetDaysInYear(Int32, Int32)When overridden in a derived class, returns the number of days in the specified year and era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetEraWhen overridden in a derived class, returns the era in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetHourReturns the hours value in the specified DateTime.
Public methodGetLeapMonth(Int32)Calculates the leap month for a specified year.
Public methodGetLeapMonth(Int32, Int32)Calculates the leap month for a specified year and era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetMillisecondsReturns the milliseconds value in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetMinuteReturns the minutes value in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetMonthWhen overridden in a derived class, returns the month in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetMonthsInYear(Int32)Returns the number of months in the specified year in the current era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetMonthsInYear(Int32, Int32)When overridden in a derived class, returns the number of months in the specified year in the specified era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetSecondReturns the seconds value in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetWeekOfYearReturns the week of the year that includes the date in the specified DateTime value.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetYearWhen overridden in a derived class, returns the year in the specified DateTime.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapDay(Int32, Int32, Int32)Determines whether the specified date in the current era is a leap day.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapDay(Int32, Int32, Int32, Int32)When overridden in a derived class, determines whether the specified date in the specified era is a leap day.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapMonth(Int32, Int32)Determines whether the specified month in the specified year in the current era is a leap month.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapMonth(Int32, Int32, Int32)When overridden in a derived class, determines whether the specified month in the specified year in the specified era is a leap month.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapYear(Int32)Determines whether the specified year in the current era is a leap year.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsLeapYear(Int32, Int32)When overridden in a derived class, determines whether the specified year in the specified era is a leap year.
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodStatic memberReadOnlyReturns a read-only version of the specified Calendar object.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32)Returns a DateTime that is set to the specified date and time in the current era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)When overridden in a derived class, returns a DateTime that is set to the specified date and time in the specified era.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToFourDigitYearConverts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public fieldStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryCurrentEraRepresents the current era of the current calendar.
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A calendar divides time into units, such as weeks, months, and years. The number, length, and start of the divisions vary in each calendar.

Any moment in time can be represented as a set of numeric values using a particular calendar. For example, a vernal equinox occurred at (1999, 3, 20, 8, 46, 0, 0.0) in the Gregorian calendar, that is, March 20, 1999 C.E. at 8:46:00:0.0. An implementation of Calendar can map any date in the range of a specific calendar to a similar set of numeric values, and DateTime can map such sets of numeric values to a textual representation using information from Calendar and DateTimeFormatInfo. The textual representation can be culture-sensitive, for example, "8:46 AM March 20th 1999 AD" for the en-US culture, or culture-insensitive, for example, "1999-03-20T08:46:00" in ISO 8601 format.

A Calendar implementation can define one or more eras. The Calendar class identifies the eras as enumerated integers, where the current era (CurrentEra) has the value 0.

To make up for the difference between the calendar year and the actual time that the earth rotates around the sun or the actual time that the moon rotates around the earth, a leap year has a different number of days from a standard calendar year. Each Calendar implementation defines leap years differently.

For consistency, the first unit in each interval (the first month, for example) is assigned the value 1.

The System.Globalization namespace includes the following Calendar implementations:

The following code example demonstrates the members of the Calendar class.


using System;
using System.Globalization;


public class SamplesCalendar  {

   public static void Main()  {

      // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      DateTime myDT = new DateTime( 2002, 4, 3, new GregorianCalendar() );

      // Uses the default calendar of the InvariantCulture.
      Calendar myCal = CultureInfo.InvariantCulture.Calendar;

      // Displays the values of the DateTime.
      Console.WriteLine( "April 3, 2002 of the Gregorian calendar:" );
      DisplayValues( myCal, myDT );

      // Adds 5 to every component of the DateTime.
      myDT = myCal.AddYears( myDT, 5 );
      myDT = myCal.AddMonths( myDT, 5 );
      myDT = myCal.AddWeeks( myDT, 5 );
      myDT = myCal.AddDays( myDT, 5 );
      myDT = myCal.AddHours( myDT, 5 );
      myDT = myCal.AddMinutes( myDT, 5 );
      myDT = myCal.AddSeconds( myDT, 5 );
      myDT = myCal.AddMilliseconds( myDT, 5 );

      // Displays the values of the DateTime.
      Console.WriteLine( "After adding 5 to each component of the DateTime:" );
      DisplayValues( myCal, myDT );

   }

   public static void DisplayValues( Calendar myCal, DateTime myDT )  {
      Console.WriteLine( "   Era:          {0}", myCal.GetEra( myDT ) );
      Console.WriteLine( "   Year:         {0}", myCal.GetYear( myDT ) );
      Console.WriteLine( "   Month:        {0}", myCal.GetMonth( myDT ) );
      Console.WriteLine( "   DayOfYear:    {0}", myCal.GetDayOfYear( myDT ) );
      Console.WriteLine( "   DayOfMonth:   {0}", myCal.GetDayOfMonth( myDT ) );
      Console.WriteLine( "   DayOfWeek:    {0}", myCal.GetDayOfWeek( myDT ) );
      Console.WriteLine( "   Hour:         {0}", myCal.GetHour( myDT ) );
      Console.WriteLine( "   Minute:       {0}", myCal.GetMinute( myDT ) );
      Console.WriteLine( "   Second:       {0}", myCal.GetSecond( myDT ) );
      Console.WriteLine( "   Milliseconds: {0}", myCal.GetMilliseconds( myDT ) );
      Console.WriteLine();
   }

}


/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar:
   Era:          1
   Year:         2002
   Month:        4
   DayOfYear:    93
   DayOfMonth:   3
   DayOfWeek:    Wednesday
   Hour:         0
   Minute:       0
   Second:       0
   Milliseconds: 0

After adding 5 to each component of the DateTime:
   Era:          1
   Year:         2007
   Month:        10
   DayOfYear:    286
   DayOfMonth:   13
   DayOfWeek:    Saturday
   Hour:         5
   Minute:       5
   Second:       5
   Milliseconds: 5

*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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

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