tzdata does not remove timezone names. If the 'Asia/Manila' timezone changes to the 'Asia/Shanghai' timezone, the old timezone will still exist, but a rule wil

tzdata does not remove timezone names. If the 'Asia/Manila' timezone changes to the 'Asia/Shanghai' timezone, the old timezone will still exist, but a rule will be added to indicate the change. The tz name here is a specific name in the tzdata database, so it's quite easy for that database to never remove any entries, but to rather deprecate them or link them to new ones, if appropriate.