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

Last reviewed: August 29, 1997
Article ID: Q109703

The information in this article applies to:

Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97

SUMMARY

Moderate: Requires basic macro, coding, and interoperability skills.

This article demonstrates two methods of returning the total number of days in the current month. The first method uses a query, and the second method uses a user-defined function.

MORE INFORMATION

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

Create a module and type the following line in the Declarations section:

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

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:

   =DaysInMonth(<date value or variable>)

REFERENCES

For more information about date functions, search for "Date data type, functions," and then view each of the date function topics using the Microsoft Access 97 Help Index.

Keywords          : kbprg PgmHowTo
Version           : 1.0 1.1 2.0 7.0 97
Platform          : WINDOWS
Hardware          : x86
Issue type        : kbhowto

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Last reviewed: August 29, 1997
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