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

DateOffset ( startdate ; monthoffset ; dayoffset ; yearoffset)

Rate this function:  

  Average rating: 4.5  (39 votes)
  Discuss this Custom Function

Erik Wegweiser, Intelligent Database

Returns a start date, plus or minus a specified number of months, days or years.

Sample Input:
DateOffset ( tuday ; -18 ; 7 ; 0)
Sample Output:
3/29/2006 [ if tuday is 9/22/2007]

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


Returns a start date, plus or minus a specified number of months, days or years. For example, avoids the need for substituting the less accurate "365 * 1.5" (or 547 or 547.5? or 548) for an 18-month offset in date calculations. Also makes it easier to read and remember that the date is adjusted by 18 months (rather than remember what 547 days represents).

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


Thanks for the CF. It worked perfectly. I needed to select records for a 12 month period starting with the month the client wanted and going backwards for 11 months. Your function was great in solving this problem. Thanks for sharing.

Michele Olson, Minnesota
July 10, 2012 7:33pm

What about March 31 plus one month? The above gives May 1 but wouldn't you want April 30?

David, USA
February 01, 2015 8:19pm

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 7 + 9 =
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