Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between est and mst?
Eastern Standard Time (est) is UTC-4 and Mountain Standard Time (mst) is UTC-6. The difference between them is 2 hours.
Where is est used?
Eastern Standard Time (est) is used in USA and surrounding regions. The IANA timezone identifier is America/New_York.
Where is mst used?
Mountain Standard Time (mst) is used in USA and surrounding regions. The IANA timezone identifier is America/Denver.
How do I convert est to mst?
Use the interactive converter above. Drag the time slider to any est time and the mst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
EST (New York) is 2 hours ahead of MST (Denver). When EST (New York) clocks hit noon, MST (Denver) reads 10:00.
EST (New York) is in the America/New_York timezone. MST (Denver) is in America/Denver. The difference is 2 hours.
Business hours comparison
Every working day, EST (New York) and MST (Denver) are both in business hours for 6 hours simultaneously.
00:0006:0012:0018:0024:00
EST (New York)
MST (Denver)
Overlap (6h)
When to schedule across time zones
Both EST (New York) and MST (Denver) are in standard hours simultaneously for 6h per day. 3 recommended slots shown below.
11:00 New York / 09:00 Denver✓ Both working
12:00 New York / 10:00 Denver✓ Both working
13:00 New York / 11:00 Denver✓ Both working
Based on standard 09:00–17:00 working hours in each location's local time.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
EST (New York)8 holidays
Jun 19Juneteenth National Independence DaySOON
Jul 3Independence Day
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
MST (Denver)8 holidays
Jun 19Juneteenth National Independence DaySOON
Jul 3Independence Day
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Working across EST (New York) and MST (Denver)
Working across EST (New York) (USA) and MST (Denver) (USA) involves a 2-hour gap. The good news: there is a 6-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.
💡 Best practice for cross-timezone meetings
✅
11:00–12:00 in EST (New York) = 09:00–10:00 in MST (Denver). Both sides are in standard business hours during this window.
✅
12:00–13:00 in EST (New York) = 10:00–11:00 in MST (Denver). Both sides are in standard business hours during this window.
✅
13:00–14:00 in EST (New York) = 11:00–12:00 in MST (Denver). Both sides are in standard business hours during this window.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Use the time slider above to find the exact equivalent time for any moment in EST (New York). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
