What is a zone.tab file and what is its purpose?

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The zone.tab is a text file used in Linux and Unix systems that provides a mapping between the country codes and names and the timezone data. It is located in the IANA (Internet Assigned Numbers Authority) Time Zone Database, which typically resides in the /usr/share/zoneinfo directory in a Linux/Unix filesystem.

The file is organized into three tab-separated fields: country codes, coordinates, and timezone identifiers. Here's a small snippet as an example:

    GB  +513030-0000731 Europe/London
    GR  +3752+02343    Europe/Athens
    GL  +6411-05144    America/Godthab

The first field contains the two-letter country codes as defined by ISO 3166. The second field represents the approximate geographical location of the area, denoted by a '+' or '-' for north/south and east/west respectively. The third field specifies the timezone identifier used in the IANA Time Zone Database.

This file is typically used by software programs and systems to display the correct time based on the user's geographic location and is updated whenever the timezone legislation changes.

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