You need to upgrade your Flash PlayerThis is replaced by the Flash content. Daylight-Saving Time is not in effect. Mountain Standard Time (MST) is 7 hours behind Greenwich Mean Time (GMT-7). Like most states in the U.S., Daylight-Saving Time is observed in MST, where the time is shifted forward by 1 hour to MDT; which is 6 hours behind Greenwich Mean Time (GMT-6). After the Summer months the time is shifted back by 1 hour to Mountain Standard Time (MST) or (GMT-7). Daylight Saving Time starts on 3/11/2012 2:00:00 AM local standard time.Daylight Saving Time ends on 11/4/2012 2:00:00 AM local daylight time.