# DateTime.IsLeapYear(Int32) Metodo

## 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

Anno di 4 cifre.A 4-digit year.

#### Restituisce

Boolean

`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.

## Esempio

Nell'esempio seguente viene usato il IsLeapYear 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);
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

`year` viene 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.

`year` viene 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 dell'oggetto calendario `IsLeapYear` .To determine whether a particular year was a leap year in some other calendar, call that calendar object's `IsLeapYear` method.