MST to EDT Time Converter
Eastern Daylight Time (EDT) is currently 3 hours ahead of Mountain Standard Time (MST). MST is UTC-7 and EDT is UTC-4. 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 9:00 AM and 2:00 PM in MST, which is 12:00 PM to 5:00 PM in EDT.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: MST to EDT
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?
MST and EDT are fixed offsets, so the difference between them never changes.
MST is UTC-7. Most of the Mountain region switches to MDT (UTC-6) in summer, but Arizona stays on MST year round.
EDT is UTC-4, the summer counterpart of EST. Eastern North America uses it from March to November.
Frequently Asked Questions
How many hours ahead is EDT compared to MST?
EDT is currently 3 hours ahead of MST. MST and EDT are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in MST in EDT?
9:00 AM in MST is 12:00 PM in EDT.
What is the best time for a call between MST and EDT?
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 2:00 PM in MST, which is 12:00 PM to 5:00 PM in EDT.