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 FileMaker Pro Custom Functions

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calcEndDate ( startDate; numDays; loopCount; holidayList; allowWeekends; direction )

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  Average rating: 3.9  (49 votes)
  Discuss this Custom Function

Shan Younker, Shan Younker

Calculate date by adding or subtracting days, option for skipping weekends

Sample Input:
CalcEndDate (9/9/2009; 5; 0; $$holidayList; "" ; "b")
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


Function for calculating an end date based on a start date and a number of days. Function has options to calculate forward or backwards and can allow for an end date to fall on a weekend or holiday or not. The function is a simple recursive loop that adds or subtracts one day from the start date each time through the loop, no complicated date formulas required. When the number of times through the loop equals the number of days originally passed to the function, the function returns the calculated date. If the flag is set to allow a weekend/holiday end date, the function does simply adds or subtracts the number of days from the start date.

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!

The only issue I have is:

Start Date: 3-15-10
End Date: 4-15-10

If I prepare a report in any given database, based upon these dates, and want to compare the results with data from each of the past 6 months, how many days do I tell your custom function to back up since some months have more/less days than others?


I hope you don't mind me asking.

Jeffrey E. Bloch, Fairfield, CT
February 15, 2011 3:25pm

Sorry Shan, I noticed this was and assumed these were his.

Nice work!

Jeffrey E. Bloch, Fairfield, CT
February 15, 2011 3:35pm


I'm using this custom function... calcEndDate...
which is working fine at excluding weekend dates.

However, I'm having trouble incorporating my holidayList of exclusion
dates, into the function.

I currently have a separate Holiday List file of 10 holiday records/dates.

If I am understanding correctly... I need to get these 10 date records
into a single global field, for the function to exclude the holidays from.

Not sure if this is the correct approach... please advise.

I also took the approach, of setting up a separate table, with 10 individual records... but ended up with the same resulting conundrum...

I believe the calcEndDate function requires a single global field of holiday dates.

It seems I'm still not grasping the simplicity of what needs to be done.

The sample input references $$holidayList...
however I'm not well versed in the use of global variables yet.

Jeff Byers, Ft. Lauderdale, FL
March 09, 2013 8:29am

For the holidayList, just create a field and set it to Global. In the field, just list out the holidays dates, one date per line as such:


No commas seem to be needed.

Fred, CA
October 09, 2017 4:20pm

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