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In the United States and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone. In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November.
Central (Kenton observes Mountain time on a de facto basis) Oregon: UTC−07:00 MT Yes Northern 80% of Malheur County: UTC−07:00 MST Mountain Standard Time UTC−08:00 PT Most of state: UTC−08:00 PST Pacific Standard Time Pennsylvania: UTC−05:00 ET: Yes: Eastern Puerto Rico: UTC−04:00 AT: No: Atlantic Standard Time Rhode Island: UTC− ...
UTC is, within about 1 second, mean solar time at 0°. [6] UTC does not observe daylight saving time. For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community. UTC is one of several closely related successors to GMT.
Daylight saving time was used again during World War II as a way to save energy for war production and later became a national standard in the U.S. in 1966 when Congress passed the Uniform Time Act.
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In 2024, daylight saving time will begin at 2 a.m. local time on Sunday, March 10, and end for the year at 2 a.m. on Sunday, Nov. 3. Is daylight saving time ending permanently?
Originally, daylight saving was set to start on the last Sunday of April and end on the last Sunday in October. Congress continued to tinker with it in the 70s , setting its start back to January ...
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