Another good reason to do everything in UTC.

Absolutely. Like encoding characters as bytes, representing time (stored as time_t or UTC strings) in user-readable format is a user-interface issue (ditto for input).

Normalise data to a canonical form at all the boundaries on input (and convert back to local settings on output) and a whole class of worries just go away.

Just be sure that you conversions aren't lossy :-)

In reply to Re^2: Impact of U.S. Daylight Savings Time changes in 2007 on Perl distribution/code by jbert
in thread Impact of U.S. Daylight Savings Time changes in 2007 on Perl distribution/code by kool_delhite

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