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This is a list representing time zones by country. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims). France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties).
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 .
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Redirects to America/Toronto as of version 2015c — CA +4339−07923 America/Toronto Eastern - ON & QC (most areas) −05:00: −04:00: Legally includes all of Ontario east of 90th meridian west but in practice only applied to urban areas until 1974 6483867 on OpenStreetMap: CA: America/Nipigon −05:00: −04:00: Redirects to America/Toronto ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, originally termed International Codes by the International Telegraph and Telephone Consultative Committee (C.C.I.T.T.) in 1960, [1] but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone ...
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Greenwich Mean Time is defined in law as standard time in the following countries and areas, which also advance their clocks one hour (GMT+1) in summer. United Kingdom, where the summer time is called British Summer Time (BST) Ireland, where it is called Winter Time, [22] changing to Standard Time in summer. [21] Portugal (with the exception of ...
AST is observed in parts of North America including several Caribbean islands. During part of the year, some portions of the zone observe daylight saving time , referred to as Atlantic Daylight Time ( ADT ), by moving their clocks forward one hour to UTC−03:00 .