On 2021-03-24 06:02, Paul Eggert via tz wrote:
> Proposed patch attached.
At this occasion, we should also correct the switch to
UT - 10:30 h in 1901. That this is wrong is hardly surprising:
on an island without observatory and without telegraphy lines only
sundials and the occasional navigation officer of a visiting ship
had been available to control clocks in 1901.
It may be more complicated than that. The years around 1900 looks like a busy time in the history of the Cook Islands – 15 islands spread over 2.2 million sq km (850,000 sq mi) of ocean, 8.5 degrees of longitude and 13 degrees of latitude – which may not have all been in sync. More than one time zone might be necessary to correctly reflect the ground truth, though I recognize it's out of the primary scope of tzdb. If a South Pacific history buff was interested in a project ... :)