ENUM
The time zone, standardized by the Internet Assigned Numbers Authority (IANA). IANA time zones follow this convention: /, where an area corresponds to a continent or an ocean and the location to a location within the continent.
Values
The America/Chicago IANA time zone.
The America/Denver IANA time zone.
The America/Los_Angeles IANA time zone.
The America/New_York IANA time zone.