> These time zones have hundreds of hard-coded transitions out into the future. I don’t understand why, it’s not like they all have lunar calendar stuff going o

> These time zones have hundreds of hard-coded transitions out into the future. I don’t understand why, it’s not like they all have lunar calendar stuff going on. Without any additional update to the tz database, all annual transitions are assumed to continue indefinitely. So TZif version 1 would repeat transitions up to January 2038 (i.e. the end of signed 32-bit time_t), while version 2 or later would keep them for the compatibility (see the section 4 of RFC 8536) but also include the algorithmic description in the footer for later dates.