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Getting date with last day of the month

Posted on 2007-04-07
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Last Modified: 2013-11-26
The user enters date. Now from that I need to modify the date entered in such a way that I get the date with the last day of the month. For example, if user enters 12/12/2007, then I want the code to modify this value to 31/12/2007. Or if it is 12/2/xxxx, then I should get 28/2/xxxx or 29/2/xxxx. How can I do that?

Regards,
MI
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Question by:vj_mi
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TelnetServices earned 2000 total points
ID: 18869137
Easy... use DateTime.DaysInMonth....

    Private Function LastDayOfMonth(ByVal myDate As Date) As Date
        Dim myDay As Integer
        Dim myMonth As Integer = Month(myDate)
        Dim myYear As Integer = Year(myDate)
        myDay = DateTime.DaysInMonth(myYear, myMonth)
        Dim myDateTime As New Date(myYear, myMonth, myDay)
        Return myDateTime
    End Function

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Expert Comment

by:Mike Tomlinson
ID: 18870493
*** Not for Points ***

You can use Date.Year() and Date.Month() instead of Microsoft.VisualBasic.Month() and Microsoft.VisualBasic.Year().

Re-written as a "one liner":

    Private Function LastDayOfMonth(ByVal myDate As Date) As Date
        Return New Date(myDate.Year, myDate.Month, DateTime.DaysInMonth(myDate.Year, myDate.Month))
    End Function

This is another common way it is done:

    Private Function LastDayOfMonth(ByVal myDate As Date) As Date
        Return New Date(myDate.Year, myDate.Month, 1).AddMonths(1).AddDays(-1)
    End Function
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Expert Comment

by:dash420
ID: 18874918
try this
DateTime dt1 = DateTime.Now;
Response.Write( (dt1.AddDays(-(DateTime.Now.Day -1 ))).AddMonths(1).AddDays(-1));
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