[tz] Some rules in tz specification files seem to be applied (by zic) outside of their declared period of applicability
Michael H Deckers
michael.h.deckers at googlemail.com
Wed Jan 16 12:41:05 UTC 2019
On 2019-01-15 20:48, Parsifal Herzog wrote:
I am trying to read the zic manual page as a specification, and I do not
> zic inserts that transition. It seems to me that either the last Zone
> line (SAST) would
> remain in effect until 1994, as there is no other transition defined,
> or that period is in
> an undefined state, as the SAST transition is not in effect after1990
> March 21.
> Can someone correct my understanding?
Let me try.
Your observation is correct: a "transition" in a tzdb
zone time like Africa/Windhoek does not always imply
a change in the time; it can also mean a change in the
abbreviation, or in the value of the dst bit (or any
combination of the three).
In the case at hand, the abbreviation changes from SAST
(for South African Standard Time) to CAT (Central African Time).
This change is appropriate at the date when Namibia became
independent from South Africa.
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