DateTime.IsLeapYear(Int32) Méthode

Définition

Espace de noms:
System
Assemblys:
mscorlib.dll, System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
System.Runtime.dll
Assembly:
netstandard.dll

Retourne une indication indiquant si l’année spécifiée est une année bissextile.

public:
 static bool IsLeapYear(int year);
public static bool IsLeapYear(int year);
static member IsLeapYear : int -> bool
Public Shared Function IsLeapYear (year As Integer) As Boolean

Paramètres

year
Int32

Année à 4 chiffres.

Retours

Boolean

true s’il year s’agit d’une année bissextile ; sinon, false.

Exceptions

ArgumentOutOfRangeException

year est inférieur à 1 ou supérieur à 9999.

Exemples

L’exemple suivant utilise la IsLeapYear méthode pour déterminer quelles années entre 1994 et 2014 sont des années bissextiles. L’exemple illustre également le résultat lorsque la AddYears méthode est utilisée pour ajouter une année à un jour bissextile.

using System;

public class IsLeapYear
{
   public static void Main()
   {
      for (int year = 1994; year <= 2014; year++)
      {
         if (DateTime.IsLeapYear(year))
         {
            Console.WriteLine("{0} is a leap year.", year);
            DateTime leapDay = new DateTime(year, 2, 29);
            DateTime nextYear = leapDay.AddYears(1);
            Console.WriteLine("   One year from {0} is {1}.",
                              leapDay.ToString("d"),
                              nextYear.ToString("d"));
         }
      }
   }
}
// The example produces the following output:
//       1996 is a leap year.
//          One year from 2/29/1996 is 2/28/1997.
//       2000 is a leap year.
//          One year from 2/29/2000 is 2/28/2001.
//       2004 is a leap year.
//          One year from 2/29/2004 is 2/28/2005.
//       2008 is a leap year.
//          One year from 2/29/2008 is 2/28/2009.
//       2012 is a leap year.
//          One year from 2/29/2012 is 2/28/2013.

open System

[ 1994..2014 ]
|> List.filter DateTime.IsLeapYear
|> List.iter (fun year ->
    printfn $"{year} is a leap year."
    let leapDay = DateTime(year, 2, 29)
    let nextYear = leapDay.AddYears 1
    printfn $"   One year from {leapDay:d} is {nextYear:d}.")

// The example produces the following output:
//       1996 is a leap year.
//          One year from 2/29/1996 is 2/28/1997.
//       2000 is a leap year.
//          One year from 2/29/2000 is 2/28/2001.
//       2004 is a leap year.
//          One year from 2/29/2004 is 2/28/2005.
//       2008 is a leap year.
//          One year from 2/29/2008 is 2/28/2009.
//       2012 is a leap year.
//          One year from 2/29/2012 is 2/28/2013.

Module IsLeapYear
   Public Sub Main()
      For year As Integer = 1994 to 2014
         If DateTime.IsLeapYear(year) Then
            Console.WriteLine("{0} is a leap year.", year)
            Dim leapDay As New Date(year, 2, 29)
            Dim nextYear As Date = leapDay.AddYears(1)
            Console.WriteLine("   One year from {0} is {1}.", _
                              leapDay.ToString("d"), _
                              nextYear.ToString("d"))
         End If
      Next
   End Sub
End Module
' The example displays the following output:
'       1996 is a leap year.
'          One year from 2/29/1996 is 2/28/1997.
'       2000 is a leap year.
'          One year from 2/29/2000 is 2/28/2001.
'       2004 is a leap year.
'          One year from 2/29/2004 is 2/28/2005.
'       2008 is a leap year.
'          One year from 2/29/2008 is 2/28/2009.
'       2012 is a leap year.
'          One year from 2/29/2012 is 2/28/2013.

Remarques

year est spécifié sous la forme d’un nombre à 4 chiffres en base 10 ; par exemple, 1996.

year est toujours interprété comme une année dans le calendrier grégorien. Pour déterminer si une année particulière était une année bissextile dans un autre calendrier, appelez la méthode de cet IsLeapYear objet de calendrier.

S’applique à