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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
)
public static int DaysInMonth (
	int year, 
	int month
)
public static function DaysInMonth (
	year : int, 
	month : int
) : int

Parameters

year

The year.

month

The month (a number ranging from 1 to 12).

Return Value

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.

Exception typeCondition

ArgumentOutOfRangeException

month is less than 1 or greater than 12.

-or-

year is less than 1 or greater than 9999.

The following code 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);

final int july = 7;
final 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);

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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