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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]
PST: Pacific Standard Time (North America) UTC−08:00: PT (PST/PDT) Pacific Time (North America) UTC−08:00 / UTC−07:00: PWT: Palau Time [11] UTC+09:00: PYST: Paraguay Summer Time [12] UTC−03:00: PYT: Paraguay Time [13] UTC−04:00: RET: Réunion Time: UTC+04:00: ROTT: Rothera Research Station Time UTC−03:00: SAKT: Sakhalin Island Time ...
The National Time Service Center in Mount Li, Lintong, Xi'an, Shaanxi. In the 1870s, the Shanghai Xujiahui Observatory was constructed by a French Catholic missionary. In 1880s officials in Shanghai French Concession started to provide a time announcement service using the Shanghai Mean Solar Time provided by the aforementioned observatory for ships into and out of Shanghai.
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.
UTC−08:00 – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−07:00 – Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−06:00 – Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes
Within the tz database, a timezone is any national region where local clocks have all agreed since 1970. [11] This definition concerns itself first with geographic areas which have had consistent local clocks. A timezone is different from a region with a particular standard time offset from UTC, which is often referred to as a "time zone".
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00).
The time zones of China refer to the time zone divisions used in China between 1918 and 1949. The first time zone plan was proposed by the Central Observatory (now Beijing Ancient Observatory) of the Beiyang government in Peking in 1918.