[tz] zic bug: Wall-clock ordering of transition times

Michael H Deckers michael.h.deckers at googlemail.com
Mon Dec 7 20:57:23 UTC 2020

On 2020-12-05 19:45, Tim Parenti wrote:
> Trying out "2:30" in the UNTIL field should mean that the
> Zone transition should happen 30 minutes BEFORE the US Rule would take
> effect (and thus require two transitions), but by wall-clock time, it would
> "appear" to be 30 minutes AFTER (fooling zic into thinking only the
> "latter" Zone transition is needed as the Rule would have "already" taken
> effect).  And, indeed, the results are similarly incorrect here, too:....

     If the behavior of zic is as I guess it is, a value of
          2018 Mar 11  1:59:59
     in the UNTO field will cause two jumps within 1 h + 1 s.

     Michael Deckers.

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