DateTime.IsLeapYear Method

Returns an indication whether the specified year is a leap year.

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

public static bool IsLeapYear (
	int year
public static boolean IsLeapYear (
	int year
public static function IsLeapYear (
	year : int
) : boolean
Not applicable.



A 4-digit year.

Return Value

true if year is a leap year; otherwise, false.

Exception typeCondition


year is less than 1 or greater than 9999.

year is specified as a 4-digit base 10 number; for example, 1996.

The following example illustrates the use of the IsLeapYear method to define dates that are exactly one year earlier and one year later than the current date.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0