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 FileMaker Pro Custom Functions

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LastDayOfMonth ( theDate )

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  Average rating: 4.5  (33 votes)
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Darren Terry, Pacific Data Management, Inc.

Returns the date of the last day of the specified month

Sample Input:
LastDayOfMonth ( Date ( 7 , 5, 2006 ))
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


The last day of the specified month is the "0th" day of the next month. FileMaker performs the math. This function will work for any month (including December), and will handle leap years just fine.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


I had trouble wrapping my brain around this and had to try this in a test database to see how it actually worked.

A supplied date of 12/15/2000 would evaluate to "13/0/2000", and FileMaker does the math, properly returning "12/31/2000".

Nice, simple function!

HazMatt, Blaine, MN USA
October 20, 2012 1:29pm

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