DateTime.IsLeapYear(Int32) DateTime.IsLeapYear(Int32) DateTime.IsLeapYear(Int32) DateTime.IsLeapYear(Int32) Method

Definizione

Restituisce un'indicazione che informa se l'anno specificato è bisestile.Returns an indication whether the specified year is a leap year.

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

Parametri

year
Int32 Int32 Int32 Int32

Anno di 4 cifre.A 4-digit year.

Restituisce

true se year è bisestile, in caso contrario, false.true if year is a leap year; otherwise, false.

Eccezioni

year è minore di 1 o maggiore di 9999.year is less than 1 or greater than 9999.

Esempi

Nell'esempio seguente viene usato IsLeapYear il metodo per determinare gli anni compresi tra 1994 e 2014.The following example uses the IsLeapYear method to determine which years between 1994 and 2014 are leap years. Nell'esempio viene inoltre illustrato il risultato quando il AddYears metodo viene utilizzato per aggiungere un anno a un giorno intercalare.The example also illustrates the result when the AddYears method is used to add a year to a leap day.

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.
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.

Commenti

yearviene specificato come numero in base 10 di 4 cifre. ad esempio, 1996.year is specified as a 4-digit base 10 number; for example, 1996.

yearviene sempre interpretato come anno nel calendario gregoriano.year is always interpreted as a year in the Gregorian calendar. Per determinare se un anno specifico è un anno bisestile in un altro calendario, chiamare il metodo IsLeapYear dell'oggetto calendario.To determine whether a particular year was a leap year in some other calendar, call that calendar object's IsLeapYear method.

Si applica a