1) The part of the years, I do use it in production. The fractional part, I have coded yesterday :-)

2) This condition is still not his birthday.

GOMONTH(tdBirthDate, 12 * lnYears) > tdToday

These are the days until or last your birthday.

tdToday - GOMONTH(tdBirthDate, 12 * lnYears)

And if the year is a leap year, divided by 366 these days, but by 365

IIF(YEAR(tdToday) % 4 = 0 AND (YEAR(tdToday) % 100 # 0) OR (YEAR(tdToday) % 400 = 0), 366, 365)

>Hi Luis,
>
>Couple of questions:
>
>1) has this been tested in production and found accurate, always
>2) could you document the logic a bit so I can follow what you are doing (particularly the fractions part).
>
>Thanks,
>Albert
>
>>>Hi all,
>>>
>>>Does anyone have a bulletproof function to determine "age" between 2 dates - that takes into account leap years and also is able to report back part years (as a decimal part of the number) e.g. 21.3671 for 21 years and 134 days into the next year.
>>>
>>>I wrote one years ago that loops through the years between the start date and end date adjusting for leap years and it works for the most part. It slows the report down somewhat as it is called a few hundred times and has to run this loop each time.
>>>
>>>The customer wants it to be "accurate" for the decimal part so that if it was 134 days into the new years and that year is not a leap year, it would return .3671 for the decimal portion (134/365) and if it *was* a leap year, it would return .3661 (134/365). Not sure their "logic" on that last bit is "correct" but that's what they want.
>>>
>>>So in short, a faster function than a loop would be good as long as it can return days as a decimal fraction.
>>>
>>>thanks,
>>>Albert Gostick
>>
>>Works fine with leap years.
>>
>>

>>? Age(DATE(2000,12,2))
>>
>>FUNCTION Age(tdBirthDate, tdToday)
>>  LOCAL lnYears, lnFraction
>>  IF EMPTY(tdToday)
>>    tdToday = DATE()
>>  ENDIF
>>  lnYears = YEAR(tdToday) - YEAR(tdBirthDate)
>>  IF GOMONTH(tdBirthDate, 12 * lnYears) > tdToday
>>    lnYears = lnYears - 1
>>  ENDIF
>>  lnFraction = (tdToday - GOMONTH(tdBirthDate, 12 * lnYears)) / ;
>>    IIF(YEAR(tdToday)%4 = 0 AND (YEAR(tdToday)%100 # 0) OR (YEAR(tdToday)%400 = 0), 366, 365)
>>  RETURN lnYears + lnFraction
>>ENDFUNC
>>