The database
TimeZoneManager is based upon the TZDB library (BSD License) that you can find here. Many thanks to the author for this great library.
The TZDB relays on the Iana Time Zone Database.
The Time Zone Database (often called tz or zoneinfo) 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.
TimeZoneManager will be updated at regular basis to reflect the changes of the Iana-DB.