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@iana.org> wrote:

Thanks for the additional info about Cook and Niue. Proposed further patch attached, and installed into the development repository.