Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages

Shopping Cart
Shopping Cart


Free Newsletter


Privacy Policy

FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.


 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

Easter_Sunday ( TheYear )

Rate this function:  

  Average rating: 4.8  (26 votes)
  Discuss this Custom Function

Menno van Beek, STB Automatisering & Advies BV

Calculate gregorian easter sunday method by Gauss

Sample Input:
Sample Output:
2012-04-08 (depending on systemformat)

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


Yet another formula to calculate easter.

The advantage of this one is that it follows the method by C.F.Gauss, published in 1800, that it's very short and does not depend on other custom functions.

It gives accurate dates from 1583 until 4000, beyond 4000 it's incorrect (filemaker doesn't calculate dates beyond 4000 anyway) and before 1583 the julian calandar was used and for that period this formula doesn't work either. For modernday use with the gregorian calander this formula suffices.

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


Great work.

I have taken the liberty of using your code in a custom function I have created to work out holidays in Australia.

I have given you credit in this new cf.


Vaughan, Sydney AUstralia
October 22, 2012 11:45pm

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

Your Name:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 8 + 6 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. HexUUIDToNum_cf (_uuid)
  (Sat, Jun 16, 1:55pm)
2. httpResponseCode ( responseHeaders )
  (Tue, Jun 12, 10:40pm)
3. FindDuplicateCharacters ( string )
  (Fri, Jun 08, 5:01pm)
4. FieldRepetitionLast ( field ; maxRepetition )
  (Wed, Jun 06, 6:05pm)
5. CountModifiedRecords ( NameTimestampField ; StartTimestamp ; EndTimestamp )
  (Mon, May 28, 8:23am)
6. JSONArrayLength ( JSONArrayStr )
  (Fri, May 25, 7:46am)
7. interpolation (y1; y2; y3; x1; x2; x3; x1y1; x2y1; x1y2; x2y2; rnd)
  (Sat, May 19, 3:55am)
8. @JSONFormatElements ( json )
  (Tue, May 15, 3:31am)

RSS Feed of Custom Functions