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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]
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 ...
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.
In theory, ships are supposed to adopt the standard time of a country if they are within its territorial waters within 12 nautical miles (14 mi; 22 km) of land, then revert to international time zones (15° wide pole-to-pole gores) as soon as they leave. In practice, ships use these time zones only for radio communication and similar purposes.
[6] [7] At the time, local mean time was used to set clocks, meaning that every place used its own local time based on its longitude because the time was measured by locally observing the Sun. Philippine Standard Time was instituted through Batas Pambansa Blg. 8 (that defined the metric system ), approved on December 2, 1978, and implemented on ...
The ASEAN Common Time (ACT) is a proposal to adopt a standard time for all Association of Southeast Asian Nations member states. [ 1 ] [ 2 ] It was proposed in 1995 by Singapore , and in 2004 and 2015 by Malaysia to make business across countries easier.
UTC+08:00 is an identifier for a time offset from UTC of +08:00.. With an estimated population of 1.708 billion living within the time zone, roughly 21% of the world population, it is the most populous time zone in the world, as well as a possible candidate for ASEAN Common Time.
The Philippines uses the 12-hour clock format in most oral or written communication, whether formal or informal. A colon ( : ) is used to separate the hour from the minutes (12 : 30 p.m.). The use of the 24-hour clock is usually restricted in use among airports, the military , police , and other technical purposes.