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Calendar.GetDaysInMonth Method (Int32, Int32)

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

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

public virtual int GetDaysInMonth(
	int year,
	int month
)

Parameters

year
Type: System.Int32

An integer that represents the year.

month
Type: System.Int32

A positive integer that represents the month.

Return Value

Type: System.Int32
The number of days in the specified month in the specified year in the current era.

ExceptionCondition
ArgumentOutOfRangeException

year is outside the range supported by the calendar.

-or-

month is outside the range supported by the calendar.

For example, in GregorianCalendar, GetDaysInMonth for February returns 28 in a common year or 29 in a leap year.

The following code example compares different implementations of the Calendar class.

using System;
using System.Globalization;


public class SamplesCalendar  {

   public static void Main()  {

      // Creates an instance of every Calendar type.
      Calendar[] myCals = new Calendar[8];
      myCals[0] = new GregorianCalendar();
      myCals[1] = new HebrewCalendar();
      myCals[2] = new HijriCalendar();
      myCals[3] = new JapaneseCalendar();
      myCals[4] = new JulianCalendar();
      myCals[5] = new KoreanCalendar();
      myCals[6] = new TaiwanCalendar();
      myCals[7] = new ThaiBuddhistCalendar();

      // For each calendar, displays the current year, the number of months in that year, 
      // and the number of days in each month of that year. 
      int i, j, iYear, iMonth, iDay;
      DateTime myDT = DateTime.Today;

      for ( i = 0; i < myCals.Length; i++ )  {
         iYear = myCals[i].GetYear( myDT );
         Console.WriteLine();
         Console.WriteLine( "{0}, Year: {1}", myCals[i].GetType(), myCals[i].GetYear( myDT ) );
         Console.WriteLine( "   MonthsInYear: {0}", myCals[i].GetMonthsInYear( iYear ) );
         Console.WriteLine( "   DaysInYear: {0}", myCals[i].GetDaysInYear( iYear ) );
         Console.WriteLine( "   Days in each month:" );
         Console.Write( "      " );

         for ( j = 1; j <= myCals[i].GetMonthsInYear( iYear ); j++ )
            Console.Write( " {0,-5}", myCals[i].GetDaysInMonth( iYear, j ) );
         Console.WriteLine();

         iMonth = myCals[i].GetMonth( myDT );
         iDay = myCals[i].GetDayOfMonth( myDT );
         Console.WriteLine( "   IsLeapDay:   {0}", myCals[i].IsLeapDay( iYear, iMonth, iDay ) );
         Console.WriteLine( "   IsLeapMonth: {0}", myCals[i].IsLeapMonth( iYear, iMonth ) );
         Console.WriteLine( "   IsLeapYear:  {0}", myCals[i].IsLeapYear( iYear ) );

      }

   }

}


/*
This code produces the following output.  The results vary depending on the date.

System.Globalization.GregorianCalendar, Year: 2002
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

System.Globalization.HebrewCalendar, Year: 5763
   MonthsInYear: 13
   DaysInYear: 385
   Days in each month:
       30    30    30    29    30    30    29    30    29    30    29    30    29   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  True

System.Globalization.HijriCalendar, Year: 1423
   MonthsInYear: 12
   DaysInYear: 355
   Days in each month:
       30    29    30    29    30    29    30    29    30    29    30    30   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  True

System.Globalization.JapaneseCalendar, Year: 14
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

System.Globalization.JulianCalendar, Year: 2002
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

System.Globalization.KoreanCalendar, Year: 4335
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

System.Globalization.TaiwanCalendar, Year: 91
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

System.Globalization.ThaiBuddhistCalendar, Year: 2545
   MonthsInYear: 12
   DaysInYear: 365
   Days in each month:
       31    28    31    30    31    30    31    31    30    31    30    31   
   IsLeapDay:   False
   IsLeapMonth: False
   IsLeapYear:  False

*/

.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

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, 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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