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 FileMaker Pro Custom Functions

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GetPastDate ( dateStart; monthsNumber)

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  Average rating: 4.2  (11 votes)
  Discuss this Custom Function

Robert Jackson, RJPlus Consulting

Find past date 1-12 month/s from a given date - helps construct date ranges

Sample Input:
GetPastDate ( Get(CurrentDate , 6 )

// UK date format used here
// assuming today = "25/1/2016
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 allows you to get a date - say six months ago. The idea is to help with the construction of date ranges.

dateStart & "..." & GetPastDate (would give a six month date range if monthsNumber = 6)

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


This will break if Leap Year is involved.

Lee Smith, Woodland
October 27, 2016 8:33am

Thanks for looking at this custom function Lee. It seems OK to me - I tested it with leap year options and for other years. Could you give me an example where it breaks - it would be most helpful - ta

Robert Jackson, Dundee
October 31, 2016 3:16am

No need to make it that complicated. FileMaker will happily accept a negative month number (or day, but not year) and return the appropriate date. Works for leap years too. Let FileMaker do the math!
Let( now = Get(CurrentDate) ;
Date ( Month ( now ) - 6 ; Day ( now ); Year ( now ) ) )

Tom Fitch, Portland, Oregon
October 31, 2016 3:26pm

It might be confusing because you and i have a different date structure.
i.e. yours is Day/Month/Year and mine is Month/day/year

If you are going from Mar 29 to Feb (one month) you get March 1st.

Lee Smith, Woodland
October 31, 2016 3:52pm

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