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 FileMaker Pro Custom Functions

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Easterday ( Date )

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  Average rating: 4.6  (31 votes)
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Johan Söderberg, Distingo

Calculates the date for any easterday according to Gauss formula.

Sample Input:
four_digit_yearfield ( 1963 )
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


This is a solution to calculate when Easterday will show up in the calendar year.

I made this many years ago when I was trying to develop Matt Petrovskys brilliant little calendar into something more useful. I wanted the calendar to mark all Swedish holidays and found that easterday was the only one difficult to calculate and that another three holidays were dependendant on this highly variable and seemingly unpredictable date.

With this formula all you need is a numeric field with a year in it. In the function that field is refered to as "four_digit_yearfield"

More info on Gauss formula:

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


Also 1954, 2049, 2076 and almost all years after 2099 and before 1900.

comment, VR
August 07, 2011 9:57am

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Answer 8 + 3 =
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