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JulianCalendar.IsLeapYear Method (Int32, Int32)

Determines whether the specified year in the specified era is a leap year.

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

abstract IsLeapYear : 
        year:int * 
        era:int -> bool  
override IsLeapYear : 
        year:int * 
        era:int -> bool


Type: System.Int32

An integer that represents the year.

Type: System.Int32

An integer that represents the era.

Return Value

Type: System.Boolean
true if the specified year is a leap year; otherwise, false.


year is outside the range supported by the calendar.


era is outside the range supported by the calendar.

Unlike the Gregorian calendar, the Julian calendar defines a leap year as a year that is evenly divisible by four with no exceptions. Therefore, the calendar is inaccurate by one day every 128 years. For example, the year 1999 was not a leap year, but the year 2000 was. A common year has 365 days and a leap year has 366 days.

The following example calls IsLeapYear for five years in each of the eras.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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