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GregorianCalendar.IsLeapMonth(Int32, Int32, Int32) Method

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Definition

Namespace:
System.Globalization
Assemblies:
mscorlib.dll, System.Globalization.Calendars.dll
Assembly:
System.Runtime.dll
Assembly:
System.Globalization.Calendars.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
GregorianCalendar.cs
Source:
GregorianCalendar.cs
Source:
GregorianCalendar.cs

Determines whether the specified month in the specified year in the specified era is a leap month.

public:
 override bool IsLeapMonth(int year, int month, int era);
public override bool IsLeapMonth (int year, int month, int era);
override this.IsLeapMonth : int * int * int -> bool
Public Overrides Function IsLeapMonth (year As Integer, month As Integer, era As Integer) As Boolean

Parameters

year
Int32

An integer that represents the year.

month
Int32

An integer from 1 to 12 that represents the month.

era
Int32

An integer that represents the era.

Returns

Boolean

This method always returns false, unless overridden by a derived class.

Exceptions

ArgumentOutOfRangeException

era is outside the range supported by the calendar.

-or-

year is outside the range supported by the calendar.

-or-

month is outside the range supported by the calendar.

Examples

The following code example calls IsLeapMonth for all the months in five years in the current era.

using namespace System;
using namespace System::Globalization;
int main()
{
   
   // Creates and initializes a GregorianCalendar.
   GregorianCalendar^ myCal = gcnew GregorianCalendar;
   
   // Checks all the months in five years in the current era.
   int iMonthsInYear;
   for ( int y = 2001; y <= 2005; y++ )
   {
      Console::Write( " {0}:\t", y );
      iMonthsInYear = myCal->GetMonthsInYear( y, GregorianCalendar::CurrentEra );
      for ( int m = 1; m <= iMonthsInYear; m++ )
         Console::Write( "\t {0}", myCal->IsLeapMonth( y, m, GregorianCalendar::CurrentEra ) );
      Console::WriteLine();

   }
}

/*
This code produces the following output.

2001:           False   False   False   False   False   False   False   False   False   False   False   False
2002:           False   False   False   False   False   False   False   False   False   False   False   False
2003:           False   False   False   False   False   False   False   False   False   False   False   False
2004:           False   False   False   False   False   False   False   False   False   False   False   False
2005:           False   False   False   False   False   False   False   False   False   False   False   False

*/

using System;
using System.Globalization;

public class SamplesGregorianCalendar  {

   public static void Main()  {

      // Creates and initializes a GregorianCalendar.
      GregorianCalendar myCal = new GregorianCalendar();

      // Checks all the months in five years in the current era.
      int iMonthsInYear;
      for ( int y = 2001; y <= 2005; y++ )  {
         Console.Write( "{0}:\t", y );
         iMonthsInYear = myCal.GetMonthsInYear( y, GregorianCalendar.CurrentEra );
         for ( int m = 1; m <= iMonthsInYear; m++ )
            Console.Write( "\t{0}", myCal.IsLeapMonth( y, m, GregorianCalendar.CurrentEra ) );
         Console.WriteLine();
      }
   }
}

/*
This code produces the following output.

2001:           False   False   False   False   False   False   False   False   False   False   False   False
2002:           False   False   False   False   False   False   False   False   False   False   False   False
2003:           False   False   False   False   False   False   False   False   False   False   False   False
2004:           False   False   False   False   False   False   False   False   False   False   False   False
2005:           False   False   False   False   False   False   False   False   False   False   False   False

*/

Imports System.Globalization

Public Class SamplesGregorianCalendar   
   
   Public Shared Sub Main()

      ' Creates and initializes a GregorianCalendar.
      Dim myCal As New GregorianCalendar()

      ' Checks all the months in five years in the current era.
      Dim iMonthsInYear As Integer
      Dim y As Integer
      For y = 2001 To 2005
         Console.Write("{0}:" + ControlChars.Tab, y)
         iMonthsInYear = myCal.GetMonthsInYear(y, GregorianCalendar.CurrentEra)
         Dim m As Integer
         For m = 1 To iMonthsInYear
            Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapMonth(y, m, GregorianCalendar.CurrentEra))
         Next m
         Console.WriteLine()
      Next y

   End Sub

End Class


'This code produces the following output.
'
'2001:           False   False   False   False   False   False   False   False   False   False   False   False
'2002:           False   False   False   False   False   False   False   False   False   False   False   False
'2003:           False   False   False   False   False   False   False   False   False   False   False   False
'2004:           False   False   False   False   False   False   False   False   False   False   False   False
'2005:           False   False   False   False   False   False   False   False   False   False   False   False

Remarks

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.

A leap month is an entire month that occurs only in a leap year. The Gregorian calendar does not have any leap months.

Applies to

See also