Like most states in the USA,
Daylight-Saving
Time (DST) is observed in
Montana Time, 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
Montana Time is shifted
back by 1 hour to US Mountain Standard Time (MST) or (GMT-7)