Article
11/18/2011

HebrewCalendar.IsLeapMonth Method (Int32, Int32, Int32)

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Updated: October 2010

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

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

Syntax

'Declaration
Public Overrides Function IsLeapMonth ( _
    year As Integer, _
    month As Integer, _
    era As Integer _
) As Boolean

public override bool IsLeapMonth(
    int year,
    int month,
    int era
)

Parameters

year
Type: System.Int32
An integer that represents the year.

month
Type: System.Int32
An integer from 1 to 13 that represents the month.

era
Type: System.Int32
An integer that represents the era. Specify Calendar.Eras[Calendar.CurrentEra].

Return Value

Type: System.Boolean
true if the specified month is a leap month; otherwise, false.

Exceptions

Exception	Condition
ArgumentOutOfRangeException	year, month, or era is outside the range supported by this calendar.

Remarks

This implementation of the HebrewCalendar class recognizes only the Hebrew years 5343 to 5999 (1583 to 2239 in the Gregorian calendar).

In every 19-year cycle that ends with a year that is evenly divisible by 19, the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years are leap years. A common year can have from 353 to 355 days, depending on the placement of Jewish holidays. A leap year can have from 383 to 385 days.

A leap month is an entire month that occurs only in a leap year. In the Hebrew calendar, Adar Beit is the only leap month.

Examples

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

Imports System.Globalization

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Creates and initializes a HebrewCalendar.
      Dim myCal As New HebrewCalendar()

      ' Checks all the months in five years in the current era.
      Dim iMonthsInYear As Integer
      Dim y As Integer
      For y = 5761 To 5765
         outputBlock.Text += String.Format("{0}:" + ControlChars.Tab, y)
         iMonthsInYear = myCal.GetMonthsInYear(y, HebrewCalendar.CurrentEra)
         Dim m As Integer
         For m = 1 To iMonthsInYear
            outputBlock.Text += String.Format(ControlChars.Tab + "{0}", myCal.IsLeapMonth(y, m, HebrewCalendar.CurrentEra))
         Next 
         outputBlock.Text &= vbCrLf
      Next 
   End Sub 
End Class 
'This code produces the following output.
'    5761:           False   False   False   False   False   False   False   False   False   False   False   False
'    5762:           False   False   False   False   False   False   False   False   False   False   False   False
'    5763:           False   False   False   False   False   False   True    False   False   False   False   False   False
'    5764:           False   False   False   False   False   False   False   False   False   False   False   False
'    5765:           False   False   False   False   False   False   True    False   False   False   False   False   False

using System;
using System.Globalization;


public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

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

      // Checks all the months in five years in the current era.
      int iMonthsInYear;
      for (int y = 5761; y <= 5765; y++)
      {
         outputBlock.Text += String.Format("{0}:\t", y);
         iMonthsInYear = myCal.GetMonthsInYear(y, HebrewCalendar.CurrentEra);
         for (int m = 1; m <= iMonthsInYear; m++)
            outputBlock.Text += String.Format("\t{0}", myCal.IsLeapMonth(y, m, HebrewCalendar.CurrentEra));
         outputBlock.Text += "\n";
      }

   }

}

/*
This code produces the following output.

5761:           False   False   False   False   False   False   False   False   False   False   False   False
5762:           False   False   False   False   False   False   False   False   False   False   False   False
5763:           False   False   False   False   False   False   True    False   False   False   False   False   False
5764:           False   False   False   False   False   False   False   False   False   False   False   False
5765:           False   False   False   False   False   False   True    False   False   False   False   False   False

*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Change History

Date	History	Reason
October 2010	Corrected information about the Calendar.CurrentEra field.	Content bug fix.

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