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1 The Time Zone Database (often called tz or zoneinfo) contains code

2 and data that represent the history of local time for many

3 representative locations around the globe. It is updated periodically

4 to reflect changes made by political bodies to time zone boundaries,

5 UTC offsets, and daylight-saving rules.

7 Historical local time information has been included here to:

9 * provide a compendium of data about the history of civil time that

10 is useful even if not 100% accurate;

11 * give an idea of the variety of local time rules that have existed

12 in the past and thus an idea of the variety that may be expected

13 in the future;

14 * provide a test of the generality of the local time rule description

15 system.