GetDaysInMonth Method (Int32, Int32, Int32)
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GregorianCalendar.GetDaysInMonth Method (Int32, Int32, Int32)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

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

'Declaration
Public Overrides Function GetDaysInMonth ( _
	year As Integer, _
	month As Integer, _
	era As Integer _
) As Integer

Parameters

year
Type: System.Int32
An integer that represents the year.
month
Type: System.Int32
An integer from 1 to 12 that represents the month.
era
Type: System.Int32
An integer that represents the era.

Return Value

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

ExceptionCondition
ArgumentOutOfRangeException

era is outside the range supported by the calendar.

-or-

year is outside the range supported by the calendar.

-or-

month is outside the range supported by the calendar.

For example, this method returns 28 or 29 for February (month = 2), depending on whether year is a leap year.

The following code example calls GetDaysInMonth for the second month in each of five years in each era.


Imports System.Globalization

Public Class Example
   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Creates and initializes a GregorianCalendar.
      Dim myCal As New GregorianCalendar()

      ' Displays the header.
      outputBlock.Text &= "YEAR" + ControlChars.Tab
      Dim y As Integer
      For y = 2001 To 2005
         outputBlock.Text += String.Format(vbTab + "{0}", y)
      Next y
      outputBlock.Text &= vbCrLf

      ' Displays the value of the CurrentEra property.
      outputBlock.Text &= "CurrentEra:"
      For y = 2001 To 2005
         outputBlock.Text += String.Format(ControlChars.Tab + "{0}", _
                             myCal.GetDaysInMonth(y, 2, GregorianCalendar.CurrentEra))
      Next y
      outputBlock.Text &= vbCrLf

      ' Displays the values in the Eras property.
      Dim i As Integer
      For i = 0 To myCal.Eras.Length - 1
         outputBlock.Text += String.Format("Era {0}:" + ControlChars.Tab, myCal.Eras(i))
         For y = 2001 To 2005
            outputBlock.Text += String.Format(ControlChars.Tab + "{0}", myCal.GetDaysInMonth(y, 2, myCal.Eras(i)))
         Next y
         outputBlock.Text &= vbCrLf
      Next i
   End Sub 
End Class 
' This example produces the following output.
'       YEAR            2001    2002    2003    2004    2005
'       CurrentEra:     28      28      28      29      28
'       Era 1:          28      28      28      29      28


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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