EDT to MDT Converter
Convert time between Eastern Daylight Time (EDT) and Mountain Daylight Time (MDT)
Eastern Daylight Time (EDT)
Mountain Daylight Time (MDT)
Time Difference
Mountain Daylight Time (MDT) is 0 hours ahead of Eastern Daylight Time (EDT)
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Select Time
Quick Reference
| EDT | MDT |
|---|---|
| 21:00 | 19:00 |
| 23:00 | 21:00 |
| 01:00 | 23:00 |
| 03:00 | 01:00 |
| 05:00 | 03:00 |
| 07:00 | 05:00 |
| 09:00 | 07:00 |
| 11:00 | 09:00 |
| 13:00 | 11:00 |
| 15:00 | 13:00 |
| 17:00 | 15:00 |
| 19:00 | 17:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
Related Time Zone Conversions
About EDT to MDT Time Conversion
Converting time between Eastern Daylight Time (EDT) and Mountain Daylight Time (MDT) is essential for coordinating between the East Coast and Mountain regions during summer months. Both EDT and MDT observe daylight saving time (March to November), making this a consistent 2-hour difference during the entire daylight saving period. EDT is UTC-4 while MDT is UTC-6, making MDT exactly 2 hours behind EDT.
This converter is valuable for business operations, travel planning, and personal coordination between Eastern seaboard cities (New York, Boston, Philadelphia) and Mountain region locations (Denver, Salt Lake City, Colorado Springs). The 2-hour difference creates favorable overlap for business coordination, unlike the 3-hour EDT-PDT or EDT-PST differences.
Common Use Cases for EDT to MDT Conversion
Business & Work
- Scheduling meetings between East Coast offices and Mountain region headquarters
- Coordinating between New York and Denver corporate operations
- Planning conference calls and webinars across East-to-Mountain regions
- Managing distributed teams during summer daylight saving months
- Coordinating summer project deadlines and deliverables
Personal & Travel
- Planning summer travel between Eastern and Mountain states
- Coordinating with family and friends during vacation periods
- Scheduling outdoor events and activities across regions
- Managing time-sensitive summer appointments
- Understanding local times in Mountain region vacation destinations
Time Zone Information
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4 (UTC-5 during EST)
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Boston, Philadelphia, Atlanta, Miami, Washington DC
- Coverage: Eastern United States and Canada
Mountain Daylight Time (MDT)
- UTC Offset: UTC-6 (UTC-7 during MST)
- IANA Timezone: America/Denver
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Denver, Salt Lake City, Colorado Springs, Albuquerque, Boise
- Coverage: Mountain United States and Canada
Quick Reference: EDT to MDT
Remember: MDT is always 2 hours behind EDT. Both regions observe daylight saving time from March to November
Frequently Asked Questions
What is the time difference between EDT and MDT?
Eastern Daylight Time (EDT) is UTC-4, while Mountain Daylight Time (MDT) is UTC-6. This means EDT is 2 hours ahead of MDT. When it's 12:00 PM in New York (EDT), it's 10:00 AM in Denver (MDT).
Why is EDT to MDT more favorable than EDT to PDT?
EDT to MDT has only a 2-hour difference (compared to 3-hour for PDT), creating better business coordination windows. A meeting at 10 AM EDT (8 AM MDT) is reasonable for both coasts, whereas EDT to PDT requires 9 AM EDT (6 AM PDT) meetings which are too early for West Coast offices.
When are EDT and MDT active?
Both EDT and MDT are active during the same period: from the second Sunday in March through the first Sunday in November. This makes the 2-hour difference consistent throughout the entire daylight saving time period, unlike EDT-MST which changes seasonally.
What are the best times to schedule calls between EDT and MDT zones?
Optimal meeting windows: 8-10 AM EDT (6-8 AM MDT), 10 AM-12 PM EDT (8-10 AM MDT), 2-4 PM EDT (12-2 PM MDT), and 4-5 PM EDT (2-3 PM MDT). The sweet spot is 10 AM-12 PM EDT (8-10 AM MDT) when both regions are in productive morning hours.
Why coordinate between EDT and MDT regions?
Major coordination reasons: tech companies with offices in both regions, national corporations with Eastern headquarters and Mountain distribution centers, entertainment/media production spanning coasts, retail chains coordinating operations, and summer travel/event planning between states.
How do EDT and MDT transitions affect scheduling?
EDT and MDT transition on the exact same dates (second Sunday in March and first Sunday in November), so the 2-hour difference remains consistent year-round during their active periods. You don't need to adjust for transition timing changes like you would with EDT-MST or EDT-PST comparisons.
Pro Tips
- • Use "10 AM ET / 8 AM MT" format when scheduling calls - this double notation prevents timezone confusion and helps both teams understand exact timing.
- • The 2-hour difference is ideal for summer coordination. A 10 AM EDT meeting is 8 AM MDT - early but reasonable, avoiding the extreme early mornings of EDT-PDT.
- • Best productivity window: 10 AM-12 PM EDT (8-10 AM MDT) gets both regions engaged without sacrificing work-life balance for either side.
- • Plan summer projects and events using the EDT-MDT window - the consistent 2-hour difference throughout summer months makes planning easier.
- • Both regions transition on the same dates (March and November), so maintain the same meeting time slots year-round without adjustment.
- • For Mountain region teams, schedule recurring meetings before 9 AM MDT (11 AM EDT) to avoid afternoon fatigue; for EDT teams, schedule before 5 PM EDT (3 PM MDT).
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