[tz] Further fix for Niue

[Tim Parenti]

While working on the recent changes to historical timestamps for Sierra
Leone, the unique -11:20 offset for Niue caught my eye in contemporaneous
editions of The Air Almanac which P Chan had sourced: specifically, that it
was no longer there by the late 1960s.  FInding a few more editions, I
eventually found -11:20 listed for Niue as of Apr 1964 but -11 as of Aug
1964:

Apr 1964: https://books.google.com/books?id=_1So677Y5vUC&pg=SL1-PA23
Aug 1964: https://books.google.com/books?id=MbJloqd-zyUC&pg=SL1-PA23

This points to a likely transition sometime around July 1964.  1978 did
seem awfully late for such a unique offset.

Proposed patch attached, and installed in the development repository.

--
Tim Parenti


On Wed, 24 Mar 2021 at 15:28, Paul Eggert via tz <tz at iana.org> wrote:

> Thanks for the additional info about Cook and Niue. Proposed further
> patch attached, and installed into the development repository.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mm.icann.org/pipermail/tz/attachments/20210913/64781d54/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0003-Niue-left-11-20-in-1964-not-1978.patch
Type: application/octet-stream
Size: 1974 bytes
Desc: not available
URL: <https://mm.icann.org/pipermail/tz/attachments/20210913/64781d54/0003-Niue-left-11-20-in-1964-not-1978.patch>