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 FileMaker Pro Custom Functions

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DateRange ( startDate ; finishDate ; returnType )

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  Average rating: 4.3  (32 votes)
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Michael Richards, itraining

Calculate the number of days "d", months "m" or years "y" between two dates

Sample Input:
DateRange ( 1/1/2007 ; 31/12/2007 ; "d" )
DateRange ( 1/1/2007 ; 31/12/2007 ; "m" )
DateRange ( 1/1/2007 ; 31/12/2007 ; "y" )

dates shown are in Australian format d/m/yyyy
Sample Output:

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


In a nutshell , the LET statement prepares and calculates all required variables.

The "availableDates" variable decides if both the startDate and finishDate fields supplied are available and valid.
Alternatively, only the startDate is available and valid so a date range can be calculated from the current date.

The "days" variable calculates the number of days between the two date fields.
Alternatively, the current date is used if the only the startDate field is available and valid.

The "months" variable approximates the number of months between the two date fields using the "days" calculation.
Similarly, "years" variable approximates the number of years between the two date fields using the "days" calculation.

Finally the "returnType" parameter is entered as either "d", "m" or "y" which returns the number of days, months (approximate) or years (approximate) respectively.

Probably should trap for startDate < finishDate in the LET function as well. You can do that bit.

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


There is a problem when return 3 years in months.


Let (
~startDate = Date ( 7; 1; 2017 );
~endDate = Date ( 6; 30; 2020 );
~result = round ( ( ~endDate - ~startDate ) / 30; 0 )

~result //37 wrong result!


round ( ( ~endDate - ~startDate ) / 30; 0 ) should be:
round ( ( ~endDate - ~startDate ) / 30.42; 0 )

Fabio, Italy
June 26, 2017 7:21am

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