strftime %y and negative years
Clive D.W. Feather
clive at demon.net
Wed Aug 25 09:23:45 UTC 2004
Paul Eggert said:
>> Note, by the way, that strftime is only supposed to work when the relevant
>> fields are in their "normal range". No such range is given for tm_year.
> I intepret this to mean that strftime is supposed to work regardless
> of the value of tm_year.
I would agree.
> However, the standard says that %C always generates a value in the
> range [00,99] so it would appear there's an inconsistency here.
> suppose one could argue that %C has undefined behavior for years
> outside the range [0, 9999]. But this appears to me to be a defect in
> the standard -- at least, things are quite unclear here. I would
> prefer it if strftime were required to handle all tm_year values.
So would I, but persuading WG14 might be harder.
> There is no similar restriction on the range for %Y, which suggests
> that strftime %Y must handle all tm_year values.
> For %y the range is [00,99], which argues for using modulus rather
> than remainder.
All that says is that the value must be in that range. A system that
generates %C "-2" %y "34" for the year -234 (235 B.C.) would, I think,
> Here's a test program you can use to try out your implementation.
FreeBSD appears to do the same as OpenBSD.
Clive D.W. Feather | Work: <clive at demon.net> | Tel: +44 20 8495 6138
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