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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]
World map of time zones, with the UTC−12 time zone highlighted. Anywhere on Earth ( AoE ) is a calendar designation that indicates that a period expires when the date passes everywhere on Earth. It is a practice to help specify deadlines such as "March 16, 2004, End of Day, Anywhere on Earth (AoE)" [ 1 ] without requiring timezone ...
Traditional Mongolian languages in Mongolia usually give date examples in the form 2017ᠣᠨ ᠵᠢᠷᠭᠤᠳᠤᠭᠠᠷ ᠰᠠᠷ ᠠ 2ᠡᠳᠦᠷ but this form is never used when writing in Mongolian Cyrillic; casually many people use yyyy/(m)m/(d)d or yyyy.(m)m.(d)d (with or without leading zeroes).
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
If no time zone is given or if the given time zone is not supported, then the output will default to the current hour of UTC+0 time; In this case, instead of giving a time zone, an offset (e.g. −3, 1, 5, etc.) can also be given to get the current hour of UTC+offset time (which will not be adjusted according to DST);
Each zone line for a zone specifies, for a range of date and time, the offset to UTC for standard time, the name of the set of rules that govern daylight saving time (or a hyphen if standard time always applies), the format for time zone abbreviations, and, for all but the last zone line, the date and time at which the range of date and time ...
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.
Arthur C. Clarke proposed the use of a single time zone in 1976. [2] Attempts to abolish time zones date back half a century [1] and include the Swatch Internet Time. Economics professor Steve Hanke and astrophysics professor Dick Henry at Johns Hopkins University have been proponents of the concept and have integrated it in their Hanke–Henry Permanent Calendar.