new C time interface
ncm at cantrip.org
Mon Oct 12 22:12:13 UTC 1998
[apologies if this has been seen before.]
Part of the problem with struct tm/time_t is that it works ok for
inode times but not for other equally-important uses.
The problem with the mktime model is that conversions between civil
time and timestamps can result in 2, 1, or <1 valid conversions, and
neither the user (before the conversion) nor the library is equipped
to favor one result over another, or deal properly with nonexistent
times. mktime offers no interface for the algorithm to report what
it finds, so it must falsify its results.
I hope that any interface offered to improve on mktime will expose the
information needed to write reliable code. If it is also "nice" for
the common ranges where there actually is a one-to-one mapping, that's
a bonus, but correctness should come first.
ncm at cantrip.org http://www.cantrip.org/
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