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 FileMaker Pro Custom Functions

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DateByDayOccur ( yearNum ; monthNum ; dayOfWeekNum ; dayOccurance )

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  Average rating: 4.3  (41 votes)
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Jonathan Mickelson, Thought Deveopment Corp.

Returns the date of a specific occurrence of a day of the week, for a given month and year. Ideal for holiday calculations.

Sample Input:
DateByDayOccur ( 2004; 1; 2; 3)

DateByDayOccur ( 2020; 2; 1; "")
Sample Output:
(Which was Martin Luther King Day in 2004)
(last Sunday in Feb, 2020)

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


Returns the date of a specific occurrence of a day of the week, for a given month and year. Ideal for holiday calculations. For example, to find the 3rd Tuesday in March of 2008, or the date of the last Friday in December 1954.

Data type returned - Date


yearNum - any valid Year (YYYY format)
monthNum - a Number 1-12 representing a calendar month.
dayOfWeekNum - a number 1-7 (Where Sunday = 1 ... Saturday = 7)
dayOccurance - a number 1-5 For the desired occurrence of the day of the week. Null or empty values locate the LAST occurrence of the day of the week.
For example, to find the last Saturday in May 2001 you would use: DateByDayOccur ( 2001; 5; 7; "" )

Acknowledgements - This custom function draws upon work from:
- Dan Kaplan,, for a similar PHP calculation.
- Marcos J. Montes,

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


I want to thank you for this function.
You have saved my an unimaginable amount of time re-inventing the wheel!

I was given the task of beginning a calendar display on the first Monday of the Month and ending on the last Sunday.
Your function was the final key to success.

So again, many many thanks


Alistair Hay, York, U.K.
March 31, 2016 3:49am

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