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 FileMaker Pro Custom Functions

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DayCounterHolidays ( Date_Start ; Date_End ; Days_of_Week ; Holidays )

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  Average rating: 4.4  (35 votes)
  Discuss this Custom Function

Joshua Morton, JEM Consulting

Counts number of types of days between 2 dates excluding holidays

Sample Input:
_DayCounter ( Date ( 1 ; 1 ; 2010 ) ; Date ( 1 ; 31 ; 2010 ) ; "2¶4" ; "1/1/2011¶1/17/2011)
Sample Output:

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


Returns a number counting only those days in the specified range whose day-of-week is included in the weekDays parameter and whose date does NOT exist in a list called Holidays.

For example to calculate how many lesson a music student will have during a semester based on the day of the week they take lessons and a date range but taking into account holidays.

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


Shouldn't the sample output be 8?

Bernard Cheang, Singapore
January 11, 2011 5:05am

Custom Functions have the problem of not being flexible and impossible to debug if the solution is locked.

Using a table to list holidays or days to exclude is more flexible and eliminates discrimination.

Suppose one person celebrates a religious holiday that another doesn't. Whose holiday is accepted and whose isn't? Or if your db is used in a different country. Would Britain celebrate the US's July 4th?

Using a filtered portal one can adapt to these issues.

Jack Rodgers, Hollywood, FL
March 02, 2011 2:02pm

You can set the Holiday to be a list(field) and then it could pull from data any end users could maintain in your solution. You could do something similar to decide which days to count.

Joshua Morton, NYC
March 02, 2011 2:07pm

Can you suggest a custom function for the calculation for an EndDate given a starting date, the number of days, days of week, and holidays?
EndDate ( Date_Start ; Days ; Days_of_Week ; Holidays )
Thanks in advance

Pablo D, Quito/Ecuador
June 18, 2013 10:58am

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