24:00 versus 23:59:59--insights?

Julian Cable julian.cable at bbc.co.uk
Tue Apr 28 13:11:13 UTC 2009

Whatever you decide, please don't introduce a work around that makes up-to-date systems wrong (even by a second).

It wouldn't be too hard to get zic to output a pre-1998 compatible version of its input files, which could be posted along with the new files on every release.


-----Original Message-----
From: Olson, Arthur David (NIH/NCI) [E] [mailto:olsona at dc37a.nci.nih.gov] 
Sent: 28 April 2009 12:50
To: tz at lecserver.nci.nih.gov
Subject: 24:00 versus 23:59:59--insights?

There are a few places with rules such as "... lastFri 0:00 ..." that should be "... lastThu 24:00 ..."
One possibility is to rewrite the rules that way; doing so buys error messages from pre-1998 versions of zic.
Another possibility is to rewrite the rules as "... lastThu 23:59:59 ..." which works with pre-1998 versions of zic but is a second off. A third way is to use 24:00 and, where it is used, include a comment about either upgrading zic or using the 23:59:59 dodge. I'd appreciate any insights on how to go forward.

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