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 FileMaker Pro Custom Functions

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GetWeekNumber ( selDate )

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  Average rating: 4.0  (37 votes)
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Don Wieland, DW Data Concepts

Gets the Week Number within in the Month of a selected date.

Sample Input:
GetWeekNumber ("3/16/2005")
Sample Output:

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


Gets the Week Number within in the Month of a selected 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


How do I do If I want to show what weeks that occur between two dates?

Tobias Oberg, Sweden
July 10, 2013 2:37am

s=selDay should be s=selDate

Kenneth Durrum, Miami/Florida
January 21, 2015 2:30pm

I have pasted this into the custom function edit box. When I try to save it says ' the parameter cannot be found' and the selDay is highlighted

What are the parameters I should specify?

Is there anything else I have to configure ?


Binu Alexander, India
February 24, 2015 11:58pm

Wow, this is exactly what I was looking for to create a calc field. I just want to understand the math behind it all. Why start with 9 and subtract the day of the week, etc?

Thanks for your work!

Carmen, Wichita, KS
February 05, 2016 11:02am

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