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GregorianCalendar Class

Represents the Gregorian calendar.

For a list of all members of this type, see GregorianCalendar Members.

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

[Visual Basic]
<Serializable>
Public Class GregorianCalendar
   Inherits Calendar
[C#]
[Serializable]
public class GregorianCalendar : Calendar
[C++]
[Serializable]
public __gc class GregorianCalendar : public Calendar
[JScript]
public
   Serializable
class GregorianCalendar extends Calendar

Thread Safety

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

Remarks

The Gregorian calendar recognizes two eras: B.C. (before Christ) or B.C.E. (before common era), and A.D. (Latin "Anno Domini", which means "in the year of the Lord") or C.E. (common era). This implementation of the GregorianCalendar class recognizes only the current era (A.D. or C.E.).

A leap year in the Gregorian calendar is defined as a year that is evenly divisible by four, except if 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.

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, set the Calendar property of CultureInfo.DateTimeFormat 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".

Example

[Visual Basic, C#, C++] 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.".

[Visual Basic] 
Imports System
Imports System.Globalization

Public Class SamplesGregorianCalendar

   Public Shared Sub Main()

      ' Creates strings with punctuation and without.
      Dim strADPunc As [String] = "A.D."
      Dim strADNoPunc As [String] = "AD"
      Dim strCEPunc As [String] = "C.E."
      Dim strCENoPunc As [String] = "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")
      Dim myCI As CultureInfo
      For Each 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()
      Next myCI

   End Sub 'Main 

End Class 'SamplesGregorianCalendar


'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


[C#] 
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

*/

[C++] 
#using <mscorlib.dll>
using namespace System;
using namespace System::Globalization;
using namespace System::Collections;

int main()
{
   // Creates strings with punctuation and without.
   String * strADPunc = S"A.D.";
   String * strADNoPunc = S"AD";
   String * strCEPunc = S"C.E.";
   String * strCENoPunc = S"CE";

   // Calls DTFI::GetEra for each culture that uses GregorianCalendar as the default calendar.
   Console::WriteLine(S"            ----- AD -----  ----- CE -----");
   Console::WriteLine(S"CULTURE     PUNC   NO PUNC  PUNC   NO PUNC  CALENDAR");

   IEnumerator* en =
      CultureInfo::GetCultures(CultureTypes::SpecificCultures)->GetEnumerator();
   while(en->MoveNext()){
      CultureInfo* myCI = __try_cast<CultureInfo*>(en->Current);

      Console::Write(S"{0, -12}", myCI);
      Console::Write(S"{0,-7}{1,-9}", __box(myCI -> DateTimeFormat ->GetEra(strADPunc)), 
         __box(myCI -> DateTimeFormat -> GetEra(strADNoPunc)));

      Console::Write(S"{0, -7}{1, -9}", 
         __box(myCI -> DateTimeFormat -> GetEra(strCEPunc)), 
         __box(myCI -> DateTimeFormat -> GetEra(strCENoPunc)));
      Console::Write(S"{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

*/

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Globalization

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: Mscorlib (in Mscorlib.dll)

See Also

GregorianCalendar Members | System.Globalization Namespace | Calendar | CultureInfo.Calendar | CultureInfo.OptionalCalendars

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