It should be noted that a few other countries have also used winter time,
according to <https://en.wikipedia.org/wiki/Winter_time_(clock_lag) > (but
I agree with the argument that tm_isdst is best defined as indicating
whether the clocks are advanced compared to time used for the rest of the
year, *not* based on whether the wording of the laws in question defines
one time as standard and the other as a variation from it - there's no
reason laws need to define one time as standard and the other as a
variation at all).
--
Joseph S. Myers
jsm@polyomino.org.uk