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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.


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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