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Like most states in the USA, Daylight-Saving Time ( DST ) is observed in Wyoming , where the time is shifted forward by 1 hour to Mountain Daylight Time ( MDT ); which is 6 hours behind Greenwich Mean Time ( GMT-6 ).
After the Summer months the time in Wyoming is shifted back by 1 hour to US Mountain Standard Time (MST) or ( GMT-7 )
Sunday 13 March 2016 2am local time
until Sunday 6 November 2016 2am local time
see: Daylight-Saving-Time.com for details
USA and Canada Standard Time Date schedules here