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 FileMaker Pro Custom Functions

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SubtractTimes ( Time1 ; Time2 )

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  Average rating: 4.7  (23 votes)
  Discuss this Custom Function

Bill Thurmes, Miyota Development Center of America

Subtract one time from another; both times in h:mm:ss format

Sample Input:
SubtractTimes ( "59:43" ; "28:13" )
SubtractTimes ( "2:01:58" ; "29:54" )
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


Time2 will be subtracted from Time1
Entry format should be h:mm:ss, or mm:ss, or ss.
Result will be in same format, dropping unneeded info from left.
Primarily useful if data is/might be in a mm:ss format
It now gives the correct answer if Time1 is earlier than Time2

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


Filemaker can add and subtract times natively.

comment, VR
April 10, 2014 11:48am

Thanks, VR. I had needed something to subtract text that was in a mm:ss format, which Filemaker's native time addition doesn't deal with well. I've changed the script to use Filemaker's native capabilities.

Bill Thurmes, MDCA
April 11, 2014 11:07am

Is there a way to accept non military time? If time 1 occurs before noon, and time 2 occurs after noon, the results are in the wrong direction.

K.C., San Francisco
October 17, 2014 7:02pm

I assume you want a negative result when Time1 is before Time2? That it didn't work before was a bug in my function; in the final case statement I had forgotten to apply sign to t; I've fixed that now.

Bill Thurmes, Longmont, CO
October 22, 2014 2:43pm

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