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From: "Siegfried Heintze" <siegfried@heintze.com>
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Subject: How to: 96 bit Date-time arithmetic?
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How do I add delta times and subtract absolute times stored in the 96 bit (3
integer) format? Apparently the functions encode and decode will help me
convert to and from the 96 bit time format.

I want to increment times by 1 day and have emacs properly figure out when
there is a Feb 28.