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DateDifferenceInMonths

Calculates the number of months difference between two dates, where Date2 is later than Date1.

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simes - Show more from this author

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

( Year ( Date2 + 1 ) - Year ( Date1 + 1 ) ) * 12 + ( Month ( Date2 + 1 ) - Month ( Date1 + 1 ) ) - If ( Day ( Date2 + 1 ) = Day ( Date1 ) ; 0 ; If ( Day ( Date2 + 1 ) < Day ( Date1 + 1 ) ; 1 ; 0 ) ) Click to copy

Republished from:
https://support.claris.com/s/article/Calculation-for-Elapsed-Months-1503692919780

Example:
Current date (Date1): 29/03/2024 - End of contract (Date2): 09/05/2025 = End of contract: 13 Months (DateDifferenceInMonths)

 

Comments

		Richard DeShong, Logic Tools Oct 16, 2025
Hi simes, thanks for posting the code from the Claris article. Please consider MonthsBetween(), as it returns a real number (x.xxx) representing the full and partial months between. That give you the option of using Int(), Round(), or Max(), as needed.

		simes Oct 17, 2025
Consider your custom function called: MonthsBetween() ? thanks, will check it out

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