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List:       ruby-talk
Subject:    Re: Calculating the age given DOB
From:       Clifford Heath <no () spam ! please ! net>
Date:       2007-03-14 16:10:05
Message-ID: 45f81dea$0$16554$afc38c87 () news ! optusnet ! com ! au
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Brian Adkins wrote:
> (DateTime.now - birthdate) / 365.25

That's not very reliable. There are algorithms that calculate
the number of days since some epoch from a date, and the
reverse, based on Fortran code that was posted in the CACM
sometime around 1970. I have a copy somewhere, but there
must be a modern version already in Ruby. If you can't
find a way, I'll dig out mine.

Just convert both dates to days-since-epoch and subtract.

Clifford.

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