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Mountain Standard Time

British  

noun

  1.  MST.  one of the standard times used in North America, seven hours behind Greenwich Mean Time

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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During the War Time period, Phoenix and most of Arizona added 1 hour to Mountain Standard Time to what is now known as Mountain Daylight Time.

From Fox News Mar. 11, 2021

Being on Mountain Standard Time year-round would have the same effect as being on Pacific Daylight Time year-round.

From Seattle Times Oct. 10, 2019

Mountain Standard Time and close twelve hours later.

From Time Magazine Archive

What we want is the middle line, which tells you the exact Mountain Standard Time, as determined by a government-run atomic clock in Boulder, Colo.

From Big Dummy's Guide to the Internet by Electronic Frontier Foundation

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