I didn't downvote you, but just for reference the time zone abbreviations you are supposed to use are in the tzdata db, and are listed https://en.wikipedia.org/

I didn't downvote you, but just for reference the time zone abbreviations you are supposed to use are in the tzdata db, and are listed https://en.wikipedia.org/wiki/List_of_tz_database_time_zones https://en.wikipedia.org/wiki/List_of_tz_database_time_zones If you don't use these, you will inevitably be somewhat wrong due to leap issues, political changes in time, or the like.