waitingkuo commented on issue #4106:
URL: 
https://github.com/apache/arrow-datafusion/issues/4106#issuecomment-1307018215

   @avantgardnerio 
   TLDR: 
   chrono-tz use 
   
   - timezone data in https://github.com/eggert/tz
   - https://github.com/chronotope/parse-zoneinfo as parser 
   
   
   
-------------------------------------------------------------------------------------------
   
   IANA timezone database maintains the offset & leapseconds
   https://www.iana.org/time-zones
   
   this repo has the database and parser (written in c)
   https://github.com/eggert/tz
   here's the sample for North America
   https://github.com/eggert/tz/blob/main/northamerica
   
   chrono-tz use
   https://github.com/eggert/tz as the timezone database
   and https://github.com/chronotope/parse-zoneinfo as parser code
   
   
   


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