GMT never changes for daylight saving time, but Mountain Time does, so the gap moves by an hour twice a year. The table below always shows the right one for your date.
Convert Greenwich Mean Time (GMT) to Mountain Standard Time (MST) for any date and time.
Mountain Time is 6 hours behind GMT from March to November, and 7 hours behind the rest of the year.
Right now GMT is UTC+0 and Mountain Time is on MST (UTC−7). Mountain Time switches to daylight saving time on 14 March 2027.
9:00 am to 5:00 pm GMT is 2:00 am to 10:00 am MST.
Greenwich Mean TimeReference
UTC+0 all year; the UK switches to BST in summer
Wed, Nov 4
Mountain Time
US & Canada; Arizona stays on MST
Tue, Nov 3Previous day
Best time to meet 4:00 PM–5:00 PM in Greenwich Mean Time on Wed, Nov 4, when everyone is inside working hours.
Book a meeting in this windowWorking hours: 9:00 AM–5:00 PM, Monday to FridayEveryone at work
Every hour of the day in GMT, converted to MST. Hatched cells are working hours (9:00 am to 5:00 pm); rows with the accent bar are working hours in both zones.
| GMT | MSTUntil 14 March 2027 | MDTFrom 14 March 2027 |
|---|---|---|
| 12:00 am GMT | 5:00 pm MST(day before) | 6:00 pm MDT(day before) |
| 1:00 am GMT | 6:00 pm MST(day before) | 7:00 pm MDT(day before) |
| 2:00 am GMT | 7:00 pm MST(day before) | 8:00 pm MDT(day before) |
| 3:00 am GMT | 8:00 pm MST(day before) | 9:00 pm MDT(day before) |
| 4:00 am GMT | 9:00 pm MST(day before) | 10:00 pm MDT(day before) |
| 5:00 am GMT | 10:00 pm MST(day before) | 11:00 pm MDT(day before) |
| 6:00 am GMT | 11:00 pm MST(day before) | 12:00 am MDT |
| 7:00 am GMT | 12:00 am MST | 1:00 am MDT |
| 8:00 am GMT | 1:00 am MST | 2:00 am MDT |
| 9:00 am GMT | 2:00 am MST | 3:00 am MDT |
| 10:00 am GMT | 3:00 am MST | 4:00 am MDT |
| 11:00 am GMT | 4:00 am MST | 5:00 am MDT |
| 12:00 pm GMT | 5:00 am MST | 6:00 am MDT |
| 1:00 pm GMT | 6:00 am MST | 7:00 am MDT |
| 2:00 pm GMT | 7:00 am MST | 8:00 am MDT |
| 3:00 pm GMT | 8:00 am MST | 9:00 am MDT |
| 4:00 pm GMT | 9:00 am MST | 10:00 am MDT |
| 5:00 pm GMT | 10:00 am MST | 11:00 am MDT |
| 6:00 pm GMT | 11:00 am MST | 12:00 pm MDT |
| 7:00 pm GMT | 12:00 pm MST | 1:00 pm MDT |
| 8:00 pm GMT | 1:00 pm MST | 2:00 pm MDT |
| 9:00 pm GMT | 2:00 pm MST | 3:00 pm MDT |
| 10:00 pm GMT | 3:00 pm MST | 4:00 pm MDT |
| 11:00 pm GMT | 4:00 pm MST | 5:00 pm MDT |
Your working hours overlap for 1 hour, from 4:00 pm GMT (9:00 am MST) to 5:00 pm GMT (10:00 am MST). That's the best window for a meeting.
Greenwich Mean Time is UTC+0.
The same time as UTC. The UK, Ireland and Portugal use GMT in winter, then switch to summer time (BST in the UK) from late March to late October. Iceland and much of West Africa stay on GMT all year.
Mountain Standard Time is UTC−7. MST is also used for Malaysia Standard Time (UTC+8). This page converts US Mountain Time.
Colorado, Utah, New Mexico, Wyoming, Montana and southern Idaho, plus Alberta in Canada. Most of Arizona stays on MST all year (the Navajo Nation follows daylight saving time). MT is the short form for the whole zone.