ACC: How to Find the Number of Days in a Month (109703)

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Query Method

Create the following new query based on any table:

NOTE: In the following example, an underscore (_) is used as a line- continuation character. Remove the underscore from the end of the line when re-creating this example.

Query: QueryTest
   --------------------------------------------------------------
   Field: DateDiff("d",Date()-(Day(Date()- 1)), DateSerial(Year _
          (Date()),(Month(Date())+1),1))
      Total: First
      Show:  True
				

This query will return an integer for the number of days in the current month. For example, if the current month is April, the query will return the integer 30.

User-Defined Function

This part of the article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to your version of the "Building Applications with Microsoft Access" manual.

NOTE: Visual Basic for Applications is called Access Basic in Microsoft Access versions 1.x and 2.0. For more information about Access Basic, please refer to the "Introduction to Programming" manual in Microsoft Access version 1.x or the "Building Applications" manual in Microsoft Access version 2.0

1. Create a module and type the following line in the Declarations section if it is not already there:
2. Type the following procedure:

         Function DaysInMonth (MyDate)
         ' This function takes a date as an argument and returns
         ' the total number of days in the month.
            Dim NextMonth, EndOfMonth
            NextMonth = DateAdd("m", 1, MyDate)
            EndOfMonth = NextMonth - DatePart("d", NextMonth)
            DaysInMonth = DatePart("d",EndOfMonth)
         End Function
   						

3. To test this function, type the following line in the Debug window (or the Immediate window in version 1.x and 2.0), and then press ENTER.

   ?DaysInMonth(Date())

   Note that the number of days in the current month are returned. To obtain the number of days in the month of a specific date, enter the specific date as follows:

   ?DaysInMonth(#11/4/93#)

   The integer 30 is returned because there are 30 days in the month of November.

To use this function in a query or form, use an equal sign (=) instead of the question mark (?) before the function name: