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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]
The database attempts to record historical time zones and all civil changes since 1970, the Unix time epoch. [7] It also records leap seconds. [8] The database, as well as some reference source code, is in the public domain. [9] New editions of the database and code are published as changes warrant, usually several times per year. [10]
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 ...
time in California = 09:30 − (−05:00) + (−08:00) = 06:30; time in India = 09:30 − (−05:00) + (+05:30) = 20:00. These calculations become more complicated near the time switch to or from daylight saving time, as the UTC offset for the area becomes a function of UTC time. The time differences may also result in different dates.
Central European Summer Time: Europe UTC+2 hours CET Central European Time: Europe UTC+1 hour CST Central Summer Time (Australia) Australia UTC+10:30 hours CST Central Standard Time: Australia UTC+9:30 hours CST Central Standard Time: North America UTC−6 hours CXT Christmas Island Time: Australia UTC+7 hours D Delta Time Zone: Military UTC+4 ...
UTC is, within about 1 second, mean solar time at 0°. [6] UTC does not observe daylight saving time. For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community. UTC is one of several closely related successors to GMT.
Terrestrial Time (TT) is a modern ... was 6.969 291 × 10 −10. In 2000, the IAU very ... The data used was insufficient to analyze long-term stability, and ...
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.