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Daylight saving time (DST) is in effect in much of the Central time zone between mid-March and early November. The modified time is called "Central Daylight Time" (CDT) and is UTC−05:00. [citation needed] In the United States, all time zones that observe DST were effectively changed by the Energy Policy Act of 2005. Beginning in 2007, DST ...
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.
The main purpose of this page is to list the current standard time offsets of different countries, territories and regions. Information on daylight saving time or historical changes in offsets can be found in the individual offset articles (e.g. UTC+01:00) or the country-specific time articles (e.g. Time in Russia).
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 zone Location(s) Offset Beijing Time: China UTC+8 hour A Alpha Time Zone: Military UTC+1 hour ACDT Australian Central Daylight Time: Australia UTC+10:30 hours ACST Australian Central Standard Time: Australia UTC+9:30 hours ADT Atlantic Daylight Time: North America UTC−3 hours AEDT Australian Eastern Daylight Time: Australia UTC+11 hours AEST
The offset from UTC changes with daylight saving time, e.g. a time offset in Chicago, which is in the North American Central Time Zone, is "−06:00" for the winter (Central Standard Time) and "−05:00" for the summer (Central Daylight Time).
UTC is also the time standard used in aviation, [8] e.g. for flight plans and air traffic control. In this context it is frequently referred to as Zulu time, as described below. Weather forecasts and maps all use UTC to avoid confusion about time zones and daylight saving time. The International Space Station also uses UTC as a time standard.
Mountain Standard/Daylight Time UTC−07:00 UTC−06:00 SKT or SKST: Saskatchewan Standard Time UTC−06:00 CT or CST: CDT: Central Standard/Daylight Time UTC−06:00 UTC−05:00 ET or EST: EDT: Eastern Standard/Daylight Time UTC−05:00 UTC−04:00 AT or AST: ADT: Atlantic Standard/Daylight Time UTC−04:00 UTC−03:00 NT or NST: NDT