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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.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


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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