Microsoft KB Archive/214313

= XL: How to Calculate the Number of Days in a Month =

Article ID: 214313

Article Last Modified on 1/24/2007

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APPLIES TO


 * Microsoft Excel 2000 Standard Edition
 * Microsoft Excel 2002 Standard Edition
 * Microsoft Excel 97 Standard Edition
 * Microsoft Excel 2001 for Mac
 * Microsoft Excel 98 for Macintosh

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This article was previously published under Q214313





SUMMARY
In Microsoft Excel, you can use date functions to calculate the number of days in a month. For example, you can use the following formula to return the number of days in a month, based on a given starting date

=DAY(DATE(YEAR,MONTH+1,0))

where  is the starting date.

This formula works by finding the "zeroth" day of the month after. Because there is no "zeroth" day of any month, this date is interpreted as the last day of the month containing. The DAY function then converts this date into a day number.

Or, to calculate the number of days in a month, given the month and year, use the following function

=DAY(DATE(, +1,1)-1)

where  is the month for which you want to return the number of days, and   is the year. This function calculates the first day of the next month and subtracts 1, which equals the last day of the current month. The DAY function then gives you the day of the month.



MORE INFORMATION
Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Partners, please visit the following Microsoft Web site:

https://partner.microsoft.com/global/30000104

For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

In Microsoft Excel, you can also use the following Visual Basic for Applications procedure: Sub Test Dim m As Integer, y As Integer, DaysInMonth As Integer ' define variable for number of the month, in this example, November m = 11 ' define variable for the year y = 1994 DaysInMonth = DateSerial(y, m + 1, 1) - DateSerial(y, m, 1) MsgBox DaysInMonth End Sub

