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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Each timezone has one or more "zone lines" in one of the tz database text files. The first zone line for a timezone gives the name of the timezone; any subsequent zone lines for that timezone leave the name blank, indicating that they apply to the same zone as the previous line.
Note: neither {{Time zone/zone.tab cols wiki6}} nor {{Time zone/zone.tab cols linked}} can currently be used for the full table in List of tz database time zones because of performance limitations in processing such a long table. They can, however, be used for a small number of rows in individual area articles.
To add a new time zone to Module:Time, add the appropriate information inside the single quotes. If a property does not apply, leave the quotes empty. The rules for each property are: [''] – (required) the abbreviation of a time zone's standard time; must be lower case; this is the value that will be used in the template's time zone pararameter
List of time zones by country – sorted by number of current time zones in the world; List of UTC offsets – current UTC offsets; List of time zone abbreviations – abbreviations; List of tz database time zones – zones used by many computer systems as defined by IANA; List of military time zones; Country-specific: List of time zones by U.S ...
If no time zone is given or if the given time zone is not supported, then the output will default to the current hour of UTC+0 time; In this case, instead of giving a time zone, an offset (e.g. −3, 1, 5, etc.) can also be given to get the current hour of UTC+offset time (which will not be adjusted according to DST);
See, for example, the map at the top of the tz database article, which is more complicated than the map at the top of time zone. Some tz database documentation uses the term "timezone", with no space between "time" and "zone", to refer to the regions that a tz database entry covers, in a somewhat-subtle attempt to distinguish tz database ...
France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties). Many countries have daylight saving time, one added hour during the local summer, but this list does not include that information. The UTC offset in the list is not valid in practice during daylight saving time.