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Alexander Gladysh <agladysh@gmail.com> wrote:
>
> But actually, in its C counterpart, `struct tm`, `tm_isdst` it is a
> tribool. Quoting `man gmtime` (did not check C89 standard sorry):
>
> `tm_isdst`  A flag that indicates whether daylight saving time is in
> effect at the time described.  The value is positive if daylight
> saving time is in effect, zero if it is not, and negative if the
> information is not available.

This is almost a direct quote from the standard.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
Fisher: Southwest, veering west later, 5 to 7, perhaps gale 8 later. Moderate
or rough. Occasional rain. Moderate or good, occasionally poor.