[PBP-pm] Working with dates

[Bennett Todd]

I'm not sure there's a one-size-fits-all best practice here.

For external representations, I really like ISO 8601 / RFC 3339,
like 2005-12-21T18:50:14Z.

For many sorts of interval calculations, I'm quite happy using
time_t (integer seconds since 1970-01-01T00:00:00Z in a POSIX
fantasy world where leap seconds don't exist), converting printable
=> time_t with Date::Parse (from TimeDate), and back with
Date::Format (likewise) if I need Date::Parse, POSIX::strftime if
not.

For quick one-offs, or anything where performance isn't that
critical (i.e. I'm not doing a zillion date calculations)
Date::Manip is comforting to have around.

-Bennett
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