IANA (Internet Assigned Numbers Authority) Time Zone Identifier. Text string that can be used to look up actual time zone information in the IANA Time Zone Database.
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The Time Zone Database (often calledtzorzoneinfo) contains code and data that represent the history of local time for many representative locations around the globe. It is updated periodically to reflect changes made by political bodies to time zone boundaries, UTC offsets, and daylight-saving rules. Its management procedure is documented inBCP 175: Procedures for Maintaining the Time Zone Database.
