GregorianCalendar.IsLeapDay(Int32, Int32, Int32, Int32) Method
Definition
Important
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Determines whether the specified date in the specified era is a leap day.
public:
override bool IsLeapDay(int year, int month, int day, int era);public override bool IsLeapDay(int year, int month, int day, int era);override this.IsLeapDay : int * int * int * int -> boolPublic Overrides Function IsLeapDay (year As Integer, month As Integer, day As Integer, era As Integer) As BooleanParameters
- year
- Int32
An integer that represents the year.
- month
- Int32
An integer from 1 to 12 that represents the month.
- day
- Int32
An integer from 1 to 31 that represents the day.
- era
- Int32
An integer that represents the era.
Returns
true if the specified day is a leap day; otherwise, false.
Exceptions
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.
-or-
day is outside the range supported by the calendar.
Examples
The following code example calls IsLeapDay for the last day of the second month (February) for five years in each of the eras.
using System;
using System.Globalization;
public class SamplesGregorianCalendar {
public static void Main() {
// Creates and initializes a GregorianCalendar.
GregorianCalendar myCal = new GregorianCalendar();
// Creates a holder for the last day of the second month (February).
int iLastDay;
// Displays the header.
Console.Write( "YEAR\t" );
for ( int y = 2001; y <= 2005; y++ )
Console.Write( "\t{0}", y );
Console.WriteLine();
// Checks five years in the current era.
Console.Write( "CurrentEra:" );
for ( int y = 2001; y <= 2005; y++ ) {
iLastDay = myCal.GetDaysInMonth( y, 2, GregorianCalendar.CurrentEra );
Console.Write( "\t{0}", myCal.IsLeapDay( y, 2, iLastDay, GregorianCalendar.CurrentEra ) );
}
Console.WriteLine();
// Checks five years in each of the eras.
for ( int i = 0; i < myCal.Eras.Length; i++ ) {
Console.Write( "Era {0}:\t", myCal.Eras[i] );
for ( int y = 2001; y <= 2005; y++ ) {
iLastDay = myCal.GetDaysInMonth( y, 2, myCal.Eras[i] );
Console.Write( "\t{0}", myCal.IsLeapDay( y, 2, iLastDay, myCal.Eras[i] ) );
}
Console.WriteLine();
}
}
}
/*
This code produces the following output.
YEAR 2001 2002 2003 2004 2005
CurrentEra: False False False True False
Era 1: False False False True False
*/
Imports System.Globalization
Public Class SamplesGregorianCalendar
Public Shared Sub Main()
' Creates and initializes a GregorianCalendar.
Dim myCal As New GregorianCalendar()
' Creates a holder for the last day of the second month (February).
Dim iLastDay As Integer
' Displays the header.
Console.Write("YEAR" + ControlChars.Tab)
Dim y As Integer
For y = 2001 To 2005
Console.Write(ControlChars.Tab + "{0}", y)
Next y
Console.WriteLine()
' Checks five years in the current era.
Console.Write("CurrentEra:")
For y = 2001 To 2005
iLastDay = myCal.GetDaysInMonth(y, 2, GregorianCalendar.CurrentEra)
Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, GregorianCalendar.CurrentEra))
Next y
Console.WriteLine()
' Checks five years in each of the eras.
Dim i As Integer
For i = 0 To myCal.Eras.Length - 1
Console.Write("Era {0}:" + ControlChars.Tab, myCal.Eras(i))
For y = 2001 To 2005
iLastDay = myCal.GetDaysInMonth(y, 2, myCal.Eras(i))
Console.Write(ControlChars.Tab + "{0}", myCal.IsLeapDay(y, 2, iLastDay, myCal.Eras(i)))
Next y
Console.WriteLine()
Next i
End Sub
End Class
'This code produces the following output.
'
'YEAR 2001 2002 2003 2004 2005
'CurrentEra: False False False True False
'Era 1: False False False True 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 day is a day that occurs only in a leap year. In the Gregorian calendar, the 29th day of February is the only leap day.
