MDT to MST Time Converter
Mountain Standard Time (MST) is currently 1 hour behind Mountain Daylight Time (MDT). MDT is UTC-6 and MST is UTC-7. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 10:00 AM and 5:00 PM in MDT, which is 9:00 AM to 4:00 PM in MST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: MDT to MST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
MDT and MST are fixed offsets, so the difference between them never changes.
MDT is UTC-6, the summer counterpart of MST, used from March to November.
MST is UTC-7. Most of the Mountain region switches to MDT (UTC-6) in summer, but Arizona stays on MST year round.
Frequently Asked Questions
How many hours behind is MST compared to MDT?
MST is currently 1 hour behind MDT. MDT and MST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in MDT in MST?
9:00 AM in MDT is 8:00 AM in MST.
What is the best time for a call between MDT and MST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 10:00 AM and 5:00 PM in MDT, which is 9:00 AM to 4:00 PM in MST.