# Age ( Birth ; theDate ; Format )

Calculates Age in three formats

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Geoff Wells DataIsland Software LLC http://www.dataisland.com |

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

The Age function will calculate a persons age, on any date, in three different formats -

1 / Years

2 / Years and Days

3 / Years, Months and Days.

## Comments

william royster, ohio Mar 26, 2009 |
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Can you find it.I hop you cn find it in a good. | ||

Alexis Gehrt, Laax / Switzerland Nov 30, 2009 |
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Just one little addition to the leap year factor that might be easily forgotten... The year 2000 is not a leap year, because it's divisible by 400. Let ( leapFactor = If ( Mod ( Year ( theDate ) ; 4 ) = 0 AND Mod ( Year ( theDate ) ; 400 ) ≠ 0 ; 1 ; 0 ); |
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Rob Woof, Sydney/Australia Aug 8, 2010 |
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Sorry, Alexis, but check your calendar again. 2000 WAS a leap year, because it's divisible by 400. The 'century' years are normally not leap years (1800, 1900), except when divisible by 400. So the calc for leapFactor should really be: leapFactor = Case ( Mod ( Year ( theDate ) ; 400 ) = 0 ; 1 ; // 'century' years divisible by 400 are leap years Mod ( Year ( theDate ) ; 100 ) = 0 ; 0 ; // 'century' years not divisible by 400 are not leap years Mod ( Year ( theDate ) ; 4 ) = 0 ; 1 ; // years divisible by 4 are leap years 0 ) |
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Rob Woof, Sydney/Australia Aug 11, 2010 |
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There's another way that bypasses the Case statement. leapFactor = If ( Mod ( Year ( theDate ) ; 400 ) = 0 ; 1 ; 0 ) // 'century' years divisible by 400 are leap years - If ( Mod ( Year ( theDate ) ; 100 ) = 0 ; 1 ; 0 ) // 'century' years not divisible by 400 are not leap years + If ( Mod ( Year ( theDate ) ; 4 ) = 0 ; 1 ; 0 ) // years divisible by 4 are leap years A year that is divisible by 400 (e.g. 1600, 2000) will evaluate to 1 - 1 + 1 = 1. A year that is divisible by 100 but not by 400 (e.g. 1300, 1900) will evaluate to 1 - 1 + 0 = 0. A year that is divisible by 4 but not by 100 (e.g. 1972, 1988) will evaluate to 1 - 0 + 0 = 1. Any other year (i.e. not a leap year) will evaluate to 0 - 0 + 0 = 0. Just another way to skin this particular cat. |
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Daniel A. Shockley, New York, NY May 4, 2011 |
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No need to do this at all: FileMaker will handle leap years itself if you use it's own date comparisons. Go look at http://www.briandunning.com/cf/518 That one lets you pick a comparison date (just use Get( CurrentDate ) for the second parameter if you want current age), handles negative age comparisons, and returns multiple formats. Also, it has the decided advantage of actually returning correct values, even when dealing with leap years and on the actual birthday anniversary because it uses FileMaker's own date comparisons to get it right. |
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David, Sacramento Dec 10, 2013 |
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Doesn't seem to work for Leap Years. Try 2008 and Feb28th then Feb29th then Mar1. It skips a date. | ||

Ukyo Matsushita, Tokyo/Japan Sep 15, 2016 |
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To be perfect, we also need to take in account the "combination" of the 4, 100 and 400. Let ( leapFactor = Case ( // Divisible by 4 // not by 100 and 400, such as 2012, 2016 Mod ( Year ( theDate ) ; 4 ) = 0 and Mod ( Year ( theDate ) ; 100 ) ≠ 0 and Mod ( Year ( theDate ) ; 400 ) ≠ 0 ; 1 ; // Leap Year // Divisible by 4 and 100 // not by 400, such as 2200, 2300, 2500, 2600 are common years Mod ( Year ( theDate ) ; 4 ) = 0 and Mod ( Year ( theDate ) ; 100 ) = 0 and Mod ( Year ( theDate ) ; 400 ) ≠ 0 ; 0 ; // Common Year // Divisible by 4 and 100 and 400 // such as 1600, 2000, 2400 are leap years Mod ( Year ( theDate ) ; 4 ) = 0 and Mod ( Year ( theDate ) ; 100 ) = 0 and Mod ( Year ( theDate ) ; 400 ) = 0 ; 1 ; // Leap Year 0 // else are Common Years ) ) ; |
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Alexis Gehrt, Switzerland Jun 13, 2018 |
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Hi everyone - maybe someone is still reading this... Personally and probably many other have used this function for years... Here's another issue with the leap years... even in the current version. Take: Birth 7th of June 2012 and today a June 7th 2018. In this exception it comes up with 5 Years, 364 Days - while apparently the child is 6 years old. Same is true for June 7th 2016. Since I didn't want to look too deeply into the formulas.. Maybe someone has a solution.... |
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Alexis Gehrt, Laax, Switzerland Aug 8, 2018 |
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After thinking about it... The Leap year does not so much play a role.. Thus, if you build it into the calculation. It goes wrong by one day and on their Birthday, the person ist only 5 year 11 Month an 30 days old. Of course the leap year plays a role for the current year... Then per person is one day older.. But if the person is born in a leap year (not particularly the 29th of February) it does not so much play a role.. "People" say... the guy is 17 year old and x-days... therefore the birth year is not important... Since I can only post 1500 Chars I have to split it into two entries |
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Part one of two, Alexis Gehrt Aug 8, 2018 |
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/* This is a Custom Function version of calculations provided in "Advanced FileMaker Pro 5.5" by Chris Moyer and Bob Bowers. This formula differs slightly from the ones in the book which do not account for leap years. 25.7.2018: Alexis Gehrt: Fix für die Falschberechnung, wenn das Geburtsdatum in einem Schaltjahr lag. Dann stimmte alles um 1 Tag nicht. AlterBerechnen_cf Input: Format Birth TheDate Format 1 = Jahre Format 2 = Jahre und Tage Format 3 = Jahre, Monate und Tage Format 4 = J, M - nur Abkürzungen */ Let ( [ leapFactorHeute = If(Mod(Year ( TheDate );400) = 0; 1; If(Mod(Year ( TheDate );100)=0; 0; If(Mod(Year ( TheDate );4) = 0; 1; 0))); leapFactorBirth = If(Mod(Year ( Birth );400) = 0; 1; If(Mod(Year ( Birth );100)=0; 0; If(Mod(Year ( Birth );4) = 0; 1; 0))); leapFactorHeuteRelevant = If (Month (TheDate) > 2 or (Month (TheDate) = 2 and Day (TheDate) > 28); leapFactorHeute;0) ] ; Case ( // Alter in Jahren Format = 1 ; Year ( TheDate ) - Year ( Birth ) - (If ((Month(TheDate) < Month(Birth)) or (Month(TheDate) = Month(Birth) and Day(TheDate) < Day(Birth)) ; 1; 0)) & " Jahre"; |
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Part two of two, Alexis Gehrt Aug 8, 2018 |
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// Age in years and days Format = 2 ; Year ( TheDate ) - Year ( Birth ) - (If ((Month(TheDate) < Month(Birth)) or (Month(TheDate) = Month(Birth) and Day(TheDate) < Day(Birth)) ; 1; 0)) & " Jahre und " & If ( (Month (TheDate) < Month(Birth)) or (Month (TheDate) = Month(Birth) and Day (TheDate) < Day(Birth)) ; Mod(DayOfYear ( TheDate ) + ( DayOfYear ( Date ( 12 ; 31 ; Year ( TheDate -1 ) ) - DayOfYear ( Date(Month(Birth);Day(Birth);Year(TheDate -1))))) ; 365); DayOfYear ( TheDate ) - DayOfYear(Date(Month(Birth);Day(Birth);Year(TheDate -1)) )) & " Tage" ; // Age in years, months and days Format = 3 ; Year ( TheDate ) - Year ( Birth ) - (If ((Month(TheDate) < Month(Birth)) or (Month(TheDate) = Month(Birth) and Day(TheDate) < Day(Birth)) ; 1; 0)) & " Jahre und " & Mod ( Month ( TheDate ) - Month ( Birth ) + 12 - (Day ( TheDate ) < Day ( Birth ) ) ; 12 ) & " Monate und " & (TheDate - Date ( Month ( TheDate ) - (Day ( TheDate ) < Day ( Birth ) ) ; Day ( Birth ) ; Year ( TheDate ) ) ) & " Tage" ; // Age in years, months Format = 4 ; Year ( TheDate ) - Year ( Birth ) - (If ((Month(TheDate) < Month(Birth)) or (Month(TheDate) = Month(Birth) and Day(TheDate) < Day(Birth)) ; 1; 0)) & "J " & Mod ( Month ( TheDate ) - Month ( Birth ) + 12 - (Day ( TheDate ) < Day ( Birth ) ) ; 12 ) & "M" ) ) |
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Douglas Alder, HomeBase Software Nov 3, 2018 |
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I added another option to show years and months only. I moved 3 to 4 and set option 3 to be this. // Age in years and months Format = 3 ; Year ( theDate ) - Year ( Birth ) - ( ( DayOfYear ( theDate ) - leapFactor ) < DayOfYear ( Birth ) ) & " years and " & Mod ( Month ( theDate ) - Month ( Birth ) + 12 - (Day ( theDate ) < Day ( Birth ) ) ; 12 ) & " months"; |
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