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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon ; [ 1 ] as a consequence, it cannot be used to specify a particular time unless a context is given.
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]
initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee; pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
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]
As a result, there are European locales that despite lying in an area with a "physical" UTC+02:00 time, are in another time zone; likewise, there are European areas that have gone for UTC+02:00, even though their "physical" time zone is different from that. Following is a list of such anomalies:
2: UTC+07:00 – Provinces of Khovd, Uvs and Bayan-Ölgii UTC+08:00 – Most of the country 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 ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 January 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 ...
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]