If you're referring to getting DateTime values on records, via the WebApi or the (deprecated) Organization Service, all times are always returned in UTC in the API responses.
If you want to get the TimeZone for a specific SystemUser (like your own user), use the WebApi to query this (where your replace the empty guid with a SystemUserId): /api/data/v8.2/usersettingscollection(00000000-0000-0000-0000-000000000000)?$top=1&$select=timeformatcode
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