USA and Canada Standard Time Date schedules here
Mountain Daylight Time is the Mountain Time Zone of the United States of America (USA). Mountain Standard Time (MST) is 7 hours behind Greenwich Mean Time (GMT-7).
In most states in the USA and in most provinces in Canada, Daylight-Saving Time (DST) is observed. During DST is 6 hours behind Greenwich Mean Time (GMT-6).
After the Summer months Mountain Time is shifted back by 1 hour to US Mountain Standard Time (MST) or (GMT-7).