Sunday 1 November 2015 2am local time
until Sunday 13 March 2016 2am local time
USA and Canada Standard Time Date schedules here
Mountain Daylight Time is the Daylight Saving Time (DST) of the Mountain Time Zone of the United States of America and Canada. MDT is 6 hours behind Greenwich Mean Time (GMT-6).
After the Summer months Mountain Time is shifted back by 1 hour to Mountain Standard Time (MST) or (GMT-7). Mountain Standard Time (MST) is 7 hours behind Greenwich Mean Time (GMT-7).