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The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. Eastern Standard Time (EST) is five hours behind Coordinated Universal Time (UTC−05:00).
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 evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
UTC−04:00 is an identifier for a time offset from UTC of −04:00. It is observed in the Eastern Time Zone (e.g., in Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time. The Atlantic Time Zone observes it during standard time (cold months).
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 ...
The Ohio Clock in the U.S. Capitol being turned forward for the country's first daylight saving time on March 31, 1918 by the Senate sergeant at arms Charles Higgins.. Most of the United States observes daylight saving time (DST), the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less.
Adopted standard time of UTC+2 in 1903. Observed annual changes to summer time in 1942–1943 (UTC+3 summer, UTC+2 standard). Observed annual changes to winter time in 1994–2017 (UTC+2 standard, UTC+1 winter) in all regions except Zambezi, which remained in UTC+2 all year. [10] Netherlands: Observed DST in 1916–1945 and since 1977. New ...
Establishing either permanent standard or daylight saving time (DST) eliminates the practice of semi-annual clock changes, specifically the advancement of clocks by one hour from standard time to DST on the second Sunday in March (commonly called "spring forward") and the retraction of clocks by one hour from DST to standard time on the first Sunday in November ("fall back").