The Mountain Time zone is an area 7 hours behind Greenwich Mean Time (GMT-7) during the winter months (referred to as MST - Mountain Standard Time) and 6 hours behind Greenwich Mean Time (GMT-6) during the summer months (referred to as MDT - Mountain Daylight Time).
In most states in the USA and in most provinces in Canada, Daylight Saving Time (DST) is observed. During DST 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 Mountain Time is shifted back by 1 hour to US Mountain Standard Time (MST) or (GMT-7).
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