Convert duration to years?

[biozic via Digitalmars-d-learn]

On Sunday, 15 January 2017 at 14:20:04 UTC, Nestor wrote:
> On Sunday, 15 January 2017 at 14:04:39 UTC, Nestor wrote:
>> ...
>> For example, take a baby born in february 29 of year 2000 
>> (leap year). In february 28 of 2001 that baby was one day 
>> short to one year.
>>
>> Family can make a concession and celebrate birthdays in 
>> february 28 of non-leap years, but march 1 is the actual day 
>> when the year of life completes. Which one to choose?
>>
>
> On second thought, if a baby was born in march 1 of 1999 
> (non-leap year), in march 1 of 2000 (leap year) the age would 
> have been one year plus one day (because of february 29).

No. A baby born on March 1st 1999 is just "one year old" on March 
1st 2000, as it also is on March 2nd or any day after during the 
same year.

> So perhaps the best thing is to always perform a "relaxed" 
> calculation.

I guess the problem of people born on February 29th is really 
application-dependent, and it also depends on the use of the 
calculated age. A social web app: users probably would like to 
see their age change on the 28th of non-leap years. A 
regulation-aware software: just follow what the law says. Etc.