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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). It includes countries and regions that observe them during standard time or year-round.
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
Eastern Daylight Time (EDT) is four hours behind Coordinated Universal Time (UTC−04:00). Observed during daylight saving time (spring/summer/early autumn in the United States and Canada). On the second Sunday in March, at 2:00 a.m. EST, clocks are advanced to 3:00 a.m. EDT, creating a 23 hour day.
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 ...
[a] Using telescopes, GMT was calibrated to the mean solar time at the prime meridian through the Royal Observatory, Greenwich. Chronometers or telegraphy were used to synchronize these clocks. [4] Standard time zones of the world. The number at the bottom of each zone specifies the number of hours to add to UTC to convert it to the local time.
UTC is calculated by the International Bureau of Weights and Measures (BIPM) [2] using weighted averages of the various times as reported by these 70+ listed timing centers. [ 3 ] [ 4 ] BIPM lists the time differences between the UTC timing centers in a monthly publication called Circular T, which contains the most up to date list of ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 17 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 ...
Eastern half of state: UTC−06:00 CST Central Standard Time UTC−07:00 MT Western half of state: UTC−07:00 MST Mountain Standard Time Tennessee: UTC−05:00 ET Yes East Tennessee, except Bledsoe, Cumberland, and Marion Counties: UTC−05:00 EST Eastern Standard Time UTC−06:00 CT Most of state: UTC−06:00 CST Central Standard Time Texas ...