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FileMaker Pro Custom Functions

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ApproxDateRange ( date1 ; date2 )

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Average rating: 3.2 (9 votes)
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Fritz Mills, Media LightBridge, LLC
http://www.medialightbridge.com/

Evaluates two dates and returns a text string that describes the difference between them to an approximately half-month precision. It doesn't matter which date is more recent.

Sample Input:

"12/6/1954" ; "4/18/1952"

Sample Output:

2 years, 8-1/2 months.

// Note: it doesn't matter which date is the older one Let ( [ oldDate = Case ( date2 ≥ date1 ; date1 ; date2 ) ; newDate = Case ( date2 ≥ date1 ; date2 ; date1 ) ; fullYr = Case ( Month ( newDate ) > Month ( oldDate ) or ( Month ( newDate ) = Month ( oldDate ) and Day ( newDate ) ≥ Day ( oldDate ) ) ; 0 ; 1 ) ; ident = Case ( oldDate = newDate ; 1 ; 0 ) ; yrs = Year ( newDate ) - Year ( oldDate ) - fullYr ; mths = Case ( fullYr = 1 ; Month ( newDate ) + 12 - Month ( oldDate ) ; Month ( newDate ) - Month ( oldDate ) ) ; apDays = Case ( Day ( newDate ) < Day ( oldDate ) ; Day ( newDate ) + 30 ; Day ( newDate ) ) - Day ( oldDate ) ; mthDaysA = If ( mths > 0 and apDays > 14 ; 1 ; 0 ) ; mthDaysO = If ( mths > 0 or apDays > 14 ; 1 ; 0 ) ] ; Case ( ident = 1 ; "Dates are the same." ; newDate - oldDate < 11 ; "Less than half a month." ; newDate - oldDate > 10 and newDate - oldDate < 25 ; "About half a month." ; newDate - oldDate > 25 and newDate - oldDate < 38 ; "About a month." ; yrs & " year" & Case ( yrs > 1 ; "s" ; "" ) & Case ( mthDaysO = 1 ; ", " & Case ( mths > 0 ; mths ; "" ) & Case ( apDays > 14 ; "–1/2" ; "" ) & " month" & Case ( mthDaysA = 1 ; "s" ; "" ) & "." ; "" ) ) )
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

Description:

This function evaluates two dates and returns a text string that describes the difference between them to an approximately half-month precision. It is designed to be used when a "conversational" date range description is most appropriate, such as when describing the difference in age between two persons of similar age, or the age of a very young child. It doesn't matter which date parameter is the more recent date.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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FileMaker Pro Custom Functions

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