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DateTime.DaysInMonth Method

Returns the number of days in the specified month and year.

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

public static int DaysInMonth(
	int year,
	int month
)

Parameters

year
Type: System.Int32
The year.
month
Type: System.Int32
The month (a number ranging from 1 to 12).

Return Value

Type: System.Int32
The number of days in month for the specified year.
For example, if month equals 2 for February, the return value is 28 or 29 depending upon whether year is a leap year.

ExceptionCondition
ArgumentOutOfRangeException

month is less than 1 or greater than 12.

-or-

year is less than 1 or greater than 9999.

The DaysInMonth method always interprets month and year as the month and year of the Gregorian calendar even if the Gregorian calendar is not the current culture's current calendar. To get the number of days in a specified month of a particular calendar, call that calendar's GetDaysInMonth method.

The following example demonstrates the DaysInMonth method.


			const int July = 7;
			const int Feb = 2;

			// daysInJuly gets 31.
			int daysInJuly = System.DateTime.DaysInMonth(2001, July);

			// daysInFeb gets 28 because the year 1998 was not a leap year.
			int daysInFeb = System.DateTime.DaysInMonth(1998, Feb);

			// daysInFebLeap gets 29 because the year 1996 was a leap year.
			int daysInFebLeap = System.DateTime.DaysInMonth(1996, Feb);


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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