JulianCalendar.IsLeapMonth(Int32, Int32, Int32) Method

Definition

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

C#
public override bool IsLeapMonth(int year, int month, int era);

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

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

Exceptions

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.

C#
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

*/

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

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.6, 2.0, 2.1
UWP 10.0

See also