[tz] Issues with pre-1970 information in TZDB

[Michael H Deckers]

On 2021-09-23 16:47, Paul Eggert via tz wrote:

> Even 'backzone' won't suffice to achieve the goal I mentioned, as I 
> vaguely recall some deleted Zones never made it to backzone way back 
> when. I don't recall the details, unfortunately.


    I only know of two cases where a timezone with data was
    converted to a link and the data never reappeared:
             America/Santa_Isabel  on 2016-01-27 (2016a)
             Pacific/Yap           on 2005-08-22 (2005l)
    Some timezones such as Asia/Ishigaki were in tzdb for a very
    short time and then were dropped without trace (1999b).

    Michael Deckers.