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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]
Time in Mongolia: Papua New Guinea: 2: UTC+10:00 – Most of the country UTC+11:00 – Autonomous Region of Bougainville (Bougainville Standard Time) Portugal: 2: UTC−01:00 – Azores UTC+00:00 – Madeira and the Main territory of Portugal: Time in Portugal: South Africa: 2: UTC+02:00 (South African Standard Time) – Main territory of South ...
The term "GMT" is also used as one of the names for the time zone UTC+00:00 and, [2] in UK law, is the basis for civil time in the United Kingdom. [ 3 ] [ a ] Because of Earth's uneven angular velocity in its elliptical orbit and its axial tilt , noon (12:00:00) GMT is rarely the exact moment the Sun crosses the Greenwich Meridian [ b ] and ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 4 February 2025. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
A number of African countries use UTC+02:00 all year long, where it is called Central Africa Time (CAT), [1] although Egypt and Libya also use the term Eastern European Time. [2] The most populous city in the Eastern European Time zone is Cairo, with the most populous EET city in Europe being Kyiv.
Daylight saving time (Hora de Verão, or "summer time", in Portuguese) was observed for the first time in 1916, during World War I, and it consisted in advancing clocks by one hour. [2] [3] [5] In that year, DST was observed from 17 June to 1 November but in following years until 1921, it was observed from 1 June to 14 October. [2] [3]
Before the wide adoption of standard time zones, local mean time was widely used in railway time for train timetables and telegraphic time for telegraphy. [7] Local mean time is a solar time that corrects the variations of local apparent time by forming a uniform time scale at a specific longitude ; [ 8 ] for instance, Liberia observed UTC−0: ...