JulianCalendar.IsLeapMonth(Int32, Int32, Int32) Method

Reference

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:: JulianCalendar.cs

Source:: JulianCalendar.cs

Source:: JulianCalendar.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

year is outside the range supported by the calendar.

-or-

month is outside the range supported by the calendar.

-or-

era is outside the range supported by the calendar.

Examples

The following 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 JulianCalendar.
   JulianCalendar^ myCal = gcnew JulianCalendar;
   
   // 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, JulianCalendar::CurrentEra );
      for ( int m = 1; m <= iMonthsInYear; m++ )
         Console::Write( "\t {0}", myCal->IsLeapMonth( y, m, JulianCalendar::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 SamplesJulianCalendar  {

   public static void Main()  {

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

      // 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, JulianCalendar.CurrentEra );
         for ( int m = 1; m <= iMonthsInYear; m++ )
            Console.Write( "\t{0}", myCal.IsLeapMonth( y, m, JulianCalendar.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 SamplesJulianCalendar   
   
   Public Shared Sub Main()

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

      ' 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, JulianCalendar.CurrentEra)
         Dim m As Integer
         For m = 1 To iMonthsInYear
            Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapMonth(y, m, JulianCalendar.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

Unlike the Gregorian calendar, the Julian calendar defines a leap year as a year that is evenly divisible by four with no exceptions. Therefore, the calendar is inaccurate by one day every 128 years. For example, the year 1999 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 Julian calendar does not have any leap months.

Applies to

Jaa