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The UTC offsets are based on the current or upcoming database rules. This table does not attempt to document any of the historical data which resides in the database. In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC.
In 1973, the last portions of Yukon switched to Pacific Time, leaving UTC−09:00 unused in Canada. In 1988, Newfoundland observed "double daylight saving time" from April 3 until October 30, meaning that the time was set ahead by 2 hours. [ 24 ]
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.
UTC−05:00 is an identifier for a time offset from UTC of −05:00. In North America, it is observed in the Eastern Time Zone during standard time, and in the Central Time Zone during the other eight months (see Daylight saving time). The western Caribbean uses it year round.
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 ...
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 ...
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).