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GregorianCalendar Class

Represents the Gregorian calendar.

System.Object
  System.Globalization.Calendar
    System.Globalization.GregorianCalendar

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

[SerializableAttribute]
[ComVisibleAttribute(true)]
public class GregorianCalendar : Calendar

The GregorianCalendar type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkGregorianCalendar()Initializes a new instance of the GregorianCalendar class using the default GregorianCalendarTypes value.
Public methodSupported by the XNA FrameworkGregorianCalendar(GregorianCalendarTypes)Initializes a new instance of the GregorianCalendar class using the specified GregorianCalendarTypes value.
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  NameDescription
Public propertyAlgorithmTypeGets a value that indicates whether the current calendar is solar-based, lunar-based, or a combination of both. (Overrides Calendar.AlgorithmType.)
Public propertySupported by the XNA FrameworkCalendarTypeGets or sets the GregorianCalendarTypes value that denotes the language version of the current GregorianCalendar.
Protected propertyDaysInYearBeforeMinSupportedYearGets the number of days in the year that precedes the year that is specified by the MinSupportedDateTime property. (Inherited from Calendar.)
Public propertySupported by the XNA FrameworkErasGets the list of eras in the GregorianCalendar. (Overrides Calendar.Eras.)
Public propertySupported by the XNA FrameworkIsReadOnlyGets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
Public propertySupported by the XNA FrameworkMaxSupportedDateTimeGets the latest date and time supported by the GregorianCalendar type. (Overrides Calendar.MaxSupportedDateTime.)
Public propertySupported by the XNA FrameworkMinSupportedDateTimeGets the earliest date and time supported by the GregorianCalendar type. (Overrides Calendar.MinSupportedDateTime.)
Public propertySupported by the XNA FrameworkTwoDigitYearMaxGets or sets the last year of a 100-year range that can be represented by a 2-digit year. (Overrides Calendar.TwoDigitYearMax.)
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  NameDescription
Public methodSupported by the XNA FrameworkAddDaysReturns a DateTime that is the specified number of days away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddHoursReturns a DateTime that is the specified number of hours away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddMillisecondsReturns a DateTime that is the specified number of milliseconds away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddMinutesReturns a DateTime that is the specified number of minutes away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddMonthsReturns a DateTime that is the specified number of months away from the specified DateTime. (Overrides Calendar.AddMonths(DateTime, Int32).)
Public methodSupported by the XNA FrameworkAddSecondsReturns a DateTime that is the specified number of seconds away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddWeeksReturns a DateTime that is the specified number of weeks away from the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkAddYearsReturns a DateTime that is the specified number of years away from the specified DateTime. (Overrides Calendar.AddYears(DateTime, Int32).)
Public methodCloneCreates a new object that is a copy of the current Calendar object. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkFinalizeAllows 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 FrameworkGetDayOfMonthReturns the day of the month in the specified DateTime. (Overrides Calendar.GetDayOfMonth(DateTime).)
Public methodSupported by the XNA FrameworkGetDayOfWeekReturns the day of the week in the specified DateTime. (Overrides Calendar.GetDayOfWeek(DateTime).)
Public methodSupported by the XNA FrameworkGetDayOfYearReturns the day of the year in the specified DateTime. (Overrides Calendar.GetDayOfYear(DateTime).)
Public methodSupported by the XNA FrameworkGetDaysInMonth(Int32, Int32)Returns the number of days in the specified month and year of the current era. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetDaysInMonth(Int32, Int32, Int32)Returns the number of days in the specified month in the specified year in the specified era. (Overrides Calendar.GetDaysInMonth(Int32, Int32, Int32).)
Public methodSupported by the XNA FrameworkGetDaysInYear(Int32)Returns the number of days in the specified year of the current era. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetDaysInYear(Int32, Int32)Returns the number of days in the specified year in the specified era. (Overrides Calendar.GetDaysInYear(Int32, Int32).)
Public methodSupported by the XNA FrameworkGetEraReturns the era in the specified DateTime. (Overrides Calendar.GetEra(DateTime).)
Public methodSupported by the XNA FrameworkGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetHourReturns the hours value in the specified DateTime. (Inherited from Calendar.)
Public methodGetLeapMonth(Int32)Calculates the leap month for a specified year. (Inherited from Calendar.)
Public methodGetLeapMonth(Int32, Int32)Calculates the leap month for a specified year and era. (Overrides Calendar.GetLeapMonth(Int32, Int32).)
Public methodSupported by the XNA FrameworkGetMillisecondsReturns the milliseconds value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetMinuteReturns the minutes value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetMonthReturns the month in the specified DateTime. (Overrides Calendar.GetMonth(DateTime).)
Public methodSupported by the XNA FrameworkGetMonthsInYear(Int32)Returns the number of months in the specified year in the current era. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetMonthsInYear(Int32, Int32)Returns the number of months in the specified year in the specified era. (Overrides Calendar.GetMonthsInYear(Int32, Int32).)
Public methodSupported by the XNA FrameworkGetSecondReturns the seconds value in the specified DateTime. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetWeekOfYearReturns the week of the year that includes the date in the specified DateTime value. (Inherited from Calendar.)

In .NET Framework Client Profile, this member is overridden by GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).


In XNA Framework, this member is overridden by GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).
Public methodSupported by the XNA FrameworkGetYearReturns the year in the specified DateTime. (Overrides Calendar.GetYear(DateTime).)
Public methodSupported by the XNA FrameworkIsLeapDay(Int32, Int32, Int32)Determines whether the specified date in the current era is a leap day. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkIsLeapDay(Int32, Int32, Int32, Int32)Determines whether the specified date in the specified era is a leap day. (Overrides Calendar.IsLeapDay(Int32, Int32, Int32, Int32).)
Public methodSupported by the XNA FrameworkIsLeapMonth(Int32, Int32)Determines whether the specified month in the specified year in the current era is a leap month. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkIsLeapMonth(Int32, Int32, Int32)Determines whether the specified month in the specified year in the specified era is a leap month. (Overrides Calendar.IsLeapMonth(Int32, Int32, Int32).)
Public methodSupported by the XNA FrameworkIsLeapYear(Int32)Determines whether the specified year in the current era is a leap year. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkIsLeapYear(Int32, Int32)Determines whether the specified year in the specified era is a leap year. (Overrides Calendar.IsLeapYear(Int32, Int32).)
Protected methodSupported by the XNA FrameworkMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32)Returns a DateTime that is set to the specified date and time in the current era. (Inherited from Calendar.)
Public methodSupported by the XNA FrameworkToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)Returns a DateTime that is set to the specified date and time in the specified era. (Overrides Calendar.ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32).)
Public methodSupported by the XNA FrameworkToFourDigitYearConverts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century. (Overrides Calendar.ToFourDigitYear(Int32).)
Public methodSupported by the XNA FrameworkToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public fieldStatic memberSupported by the XNA FrameworkADEraRepresents the current era. This field is constant.
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The Gregorian calendar recognizes two eras: B.C. or B.C.E., and A.D. or C.E. This implementation of the GregorianCalendar class recognizes only the current era (A.D. or C.E.).

NoteNote

For information about using the GregorianCalendar class and the other calendar classes in the .NET Framework, see Working with Calendars.

A leap year in the Gregorian calendar is defined as a year that is evenly divisible by 4, unless it is divisible by 100. However, years that are divisible by 400 are leap years. For example, the year 1900 was not a leap year, but the year 2000 was. A common year has 365 days and a leap year has 366 days.

The Gregorian calendar has 12 months with 28 to 31 days each: January (31 days), February (28 or 29 days), March (31 days), April (30 days), May (31 days), June (30 days), July (31 days), August (31 days), September (30 days), October (31 days), November (30 days), and December (31 days). February has 29 days during leap years and 28 during common years.

Important noteImportant

By default, all DateTime and DateTimeOffset values express dates and times in the Gregorian calendar.

The Gregorian calendar was developed as a replacement for the Julian calendar (which is represented by the JulianCalendar class) and was first introduced in a small number of cultures on October 15, 1582. When working with historic dates that precede a culture's adoption of the Gregorian calendar, you should use the original calendar if it is available in the .NET Framework. For example, Denmark changed from the Julian calendar to the Gregorian calendar on February 19 (in the Julian calendar) or March 1 (in the Gregorian calendar) of 1700. In this case, for dates before the adoption of the Gregorian calendar, you should use the Julian calendar. However, note that no culture offers intrinsic support for the JulianCalendar class. You must use the JulianCalendar class as a standalone calendar. For more information, see Working with Calendars.

The following example illustrates that February 18, 1700 in the Julian calendar, which is the last day the Julian calendar was officially used in Denmark, is one day earlier than March 1, 1700 in the Gregorian calendar.

using System;
using System.Globalization;
using System.Threading;

public class Example
{
   public static void Main()
   {
      Thread.CurrentThread.CurrentCulture = new CultureInfo("da-DK");

      JulianCalendar jc = new JulianCalendar();
      DateTime lastDate = new DateTime(1700, 2, 18, jc);
      Console.WriteLine("Last date (Gregorian): {0:d}", lastDate);
      Console.WriteLine("Last date (Julian): {0}-{1}-{2}\n", jc.GetDayOfMonth(lastDate),
                        jc.GetMonth(lastDate), jc.GetYear(lastDate));

      DateTime firstDate = lastDate.AddDays(1);
      Console.WriteLine("First date (Gregorian): {0:d}", firstDate);
      Console.WriteLine("First date (Julian): {0}-{1}-{2}",  jc.GetDayOfMonth(firstDate),
                        jc.GetMonth(firstDate), jc.GetYear(firstDate));
   }
}
// The example displays the following output: 
//       Last date (Gregorian): 28-02-1700 
//       Last date (Julian): 18-2-1700 
//        
//       First date (Gregorian): 01-03-1700 
//       First date (Julian): 19-2-1700

Each CultureInfo supports a set of calendars. The Calendar property returns the default calendar for the culture, and the OptionalCalendars property returns an array containing all the calendars supported by the culture. To change the calendar used by a CultureInfo, the application can set the Calendar property to a new Calendar.

GetEra ignores punctuation in abbreviated era names, only if the GregorianCalendar is selected in DateTimeFormatInfo.Calendar and the culture uses "A.D." as the era name, that is, "A.D." is equivalent to "AD".

The following code example shows that DateTimeFormatInfo ignores the punctuation in the era name, only if the calendar is Gregorian and the culture uses the era name "A.D.".

using System;
using System.Globalization;


public class SamplesGregorianCalendar  {

   public static void Main()  {

      // Creates strings with punctuation and without.
      String strADPunc = "A.D.";
      String strADNoPunc = "AD";
      String strCEPunc = "C.E.";
      String strCENoPunc = "CE";

      // Calls DTFI.GetEra for each culture that uses GregorianCalendar as the default calendar.
      Console.WriteLine( "            ----- AD -----  ----- CE -----" );
      Console.WriteLine( "CULTURE     PUNC   NO PUNC  PUNC   NO PUNC  CALENDAR" );
      foreach ( CultureInfo myCI in CultureInfo.GetCultures( CultureTypes.SpecificCultures ) )  {
         Console.Write( "{0,-12}", myCI );
         Console.Write( "{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra( strADPunc ), myCI.DateTimeFormat.GetEra( strADNoPunc ) );
         Console.Write( "{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra( strCEPunc ), myCI.DateTimeFormat.GetEra( strCENoPunc ) );
         Console.Write( "{0}", myCI.Calendar );
         Console.WriteLine();
      }

   }

}

/*
This code produces the following output.  This output has been cropped for brevity.

            ----- AD -----  ----- CE -----
CULTURE     PUNC   NO PUNC  PUNC   NO PUNC  CALENDAR
ar-SA       -1     -1       -1     -1       System.Globalization.HijriCalendar
ar-IQ       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-EG       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-LY       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-DZ       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-MA       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-TN       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-OM       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-YE       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-SY       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-JO       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-LB       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-KW       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-AE       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-BH       1      1        -1     -1       System.Globalization.GregorianCalendar
ar-QA       1      1        -1     -1       System.Globalization.GregorianCalendar
bg-BG       1      1        -1     -1       System.Globalization.GregorianCalendar
ca-ES       -1     -1       -1     -1       System.Globalization.GregorianCalendar
zh-TW       -1     -1       -1     -1       System.Globalization.GregorianCalendar
zh-CN       -1     -1       -1     -1       System.Globalization.GregorianCalendar
zh-HK       -1     -1       -1     -1       System.Globalization.GregorianCalendar
zh-SG       1      1        -1     -1       System.Globalization.GregorianCalendar
zh-MO       1      1        -1     -1       System.Globalization.GregorianCalendar
cs-CZ       -1     -1       -1     -1       System.Globalization.GregorianCalendar
da-DK       1      1        -1     -1       System.Globalization.GregorianCalendar

*/

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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