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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]
If present, a dagger (†) indicates the usage of a nautical time zone letter outside of the standard geographic definition of that time zone. Some zones that are north/south of each other in the mid-Pacific differ by 24 hours in time – they have the same time of day but dates that are one day apart. The two extreme time zones on Earth (both ...
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Before 1 March 1922, the Canary Islands still used mean solar time until it was discovered that the royal decree of 1900 applied only to the Peninsula and Balearic Islands. [2] The Canary Islands then used a time 1 hour behind the rest of Spain; UTC−01:00, until 16 March 1940, and since then, they have used Western European Time (UTC±00:00).
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 ...
Like America/Halifax, except DST time change happened at 12:01 am rather than 2:00 am prior to 2007. 10432327 on OpenStreetMap: CA +5320−06025 America/Goose_Bay Atlantic - Labrador (most areas) −04:00: −03:00: Like America/Halifax, except DST time change happened at 12:01 am rather than 2:00 am from 1987–2011.
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. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory .
In May 1899, in a break with the common international practice of setting one-hour intervals between adjacent time zones, South Australia advanced Central Standard Time by thirty minutes after lobbying by businesses who wanted to be closer to Melbourne time and cricketers and footballers who wanted more daylight to practice in the evenings. [3]