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HijriCalendar.IsLeapDay Method (Int32, Int32, Int32, Int32)

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Determines whether the specified date is a leap day.

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

Syntax

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

public override bool IsLeapDay(
    int year,
    int month,
    int day,
    int era
)

Parameters

  • year
    Type: System.Int32
    An integer that represents the year.
  • month
    Type: System.Int32
    An integer from 1 to 12 that represents the month.
  • day
    Type: System.Int32
    An integer from 1 to 30 that represents the day.
  • era
    Type: System.Int32
    An integer that represents the era.

Return Value

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

Exceptions

Exception Condition
ArgumentOutOfRangeException

era is outside the range supported by this calendar.

-or-

year is outside the range supported by this calendar.

-or-

month is outside the range supported by this calendar.

-or-

day is outside the range supported by this calendar.

Remarks

In every 30-year cycle that ends with a year that is evenly divisible by 30, the 2nd, 5th, 7th, 10th, 13th, 16th, 18th, 21st, 24th, 26th, and 29th years are leap years. A common year has 354 days and a leap year has 355 days.

A leap day is a day that occurs only in a leap year. In the Hijri calendar, the 30th day of Zulhijjah is the only leap day.

Examples

The following code example calls the IsLeapDay method for the last day of the second month (February) for five years in each of the eras.

Imports System.Globalization

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

      ' Creates a holder for the last day of the second month (February).
      Dim iLastDay As Integer

      ' Displays the header.
      outputBlock.Text &= "YEAR" + ControlChars.Tab
      Dim y As Integer
      For y = 1421 To 1425
         outputBlock.Text += String.Format(ControlChars.Tab + "{0}", y)
      Next y
      outputBlock.Text &= vbCrLf

      ' Checks five years in the current era.
      outputBlock.Text &= "CurrentEra:"
      For y = 1421 To 1425
         iLastDay = myCal.GetDaysInMonth(y, 2, HijriCalendar.CurrentEra)
         outputBlock.Text += String.Format(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, HijriCalendar.CurrentEra))
      Next y
      outputBlock.Text &= vbCrLf

      ' Checks five years in each of the eras.
      Dim i As Integer
      For i = 0 To myCal.Eras.Length - 1
         outputBlock.Text += String.Format("Era {0}:" + ControlChars.Tab, myCal.Eras(i))
         For y = 1421 To 1425
            iLastDay = myCal.GetDaysInMonth(y, 2, myCal.Eras(i))
            outputBlock.Text += String.Format(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, myCal.Eras(i)))
         Next y
         outputBlock.Text &= vbCrLf
      Next i
   End Sub  
End Class 
'This code produces the following output.
'       YEAR            1421    1422    1423    1424    1425
'       CurrentEra:     False   False   False   False   False
'       Era 1:          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 HijriCalendar.
      HijriCalendar myCal = new HijriCalendar();

      // Creates a holder for the last day of the second month (February).
      int iLastDay;

      // Displays the header.
      outputBlock.Text += "YEAR\t";
      for (int y = 1421; y <= 1425; y++)
         outputBlock.Text += String.Format("\t{0}", y);
      outputBlock.Text += "\n";

      // Checks five years in the current era.
      outputBlock.Text += "CurrentEra:";
      for (int y = 1421; y <= 1425; y++)
      {
         iLastDay = myCal.GetDaysInMonth(y, 2, HijriCalendar.CurrentEra);
         outputBlock.Text += String.Format("\t{0}", myCal.IsLeapDay(y, 2, iLastDay, HijriCalendar.CurrentEra));
      }
      outputBlock.Text += "\n";

      // Checks five years in each of the eras.
      for (int i = 0; i < myCal.Eras.Length; i++)
      {
         outputBlock.Text += String.Format("Era {0}:\t", myCal.Eras[i]);
         for (int y = 1421; y <= 1425; y++)
         {
            iLastDay = myCal.GetDaysInMonth(y, 2, myCal.Eras[i]);
            outputBlock.Text += String.Format("\t{0}", myCal.IsLeapDay(y, 2, iLastDay, myCal.Eras[i]));
         }
         outputBlock.Text += "\n";
      }

   }

}

/*
This code produces the following output.

YEAR            1421    1422    1423    1424    1425
CurrentEra:     False   False   False   False   False
Era 1:          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.