MDT to EDT Converter
Convert time between Mountain Daylight Time (MDT) and Eastern Daylight Time (EDT)
Mountain Daylight Time (MDT)
Eastern Daylight Time (EDT)
Time Difference
Eastern Daylight Time (EDT) is 0 hours ahead of Mountain Daylight Time (MDT)
Select Date
Select Time
Quick Reference
| MDT | EDT |
|---|---|
| 19:00 | 21:00 |
| 21:00 | 23:00 |
| 23:00 | 01:00 |
| 01:00 | 03:00 |
| 03:00 | 05:00 |
| 05:00 | 07:00 |
| 07:00 | 09:00 |
| 09:00 | 11:00 |
| 11:00 | 13:00 |
| 13:00 | 15:00 |
| 15:00 | 17:00 |
| 17:00 | 19:00 |
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 MDT to EDT Time Conversion
Converting time between Mountain Daylight Time (MDT) and Eastern Daylight Time (EDT) is essential for coordinating between the Mountain region and East Coast during daylight saving time. MDT is UTC-6 (March to November), while EDT is UTC-4 (March to November). EDT is exactly 2 hours ahead of MDT.
This conversion is crucial for coast-to-coast business operations spanning Denver, Salt Lake City, and East Coast cities like New York, Boston, and Atlanta. Both regions observe daylight saving time during the same period (March to November), making the 2-hour difference consistent throughout the summer months. Companies with offices spanning these regions can coordinate business hours with good overlap during the daylight saving season.
Common Use Cases for MDT to EDT Conversion
Business & Work
- Scheduling coast-to-coast business meetings and conference calls
- Coordinating tech companies with offices in Denver and New York
- Planning regional product launches across time zones
- Managing distributed teams spanning Mountain and East regions
Personal & Travel
- Planning coast-to-coast travel and flight schedules
- Coordinating with East Coast family and friends during summer
- Scheduling virtual events across regions
- Understanding time differences during summer daylight saving period
Time Zone Information
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, Albuquerque, Boise, Fort Collins
- Coverage: Mountain United States and parts of Canada
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, Atlanta, Miami, Philadelphia, Washington DC
- Coverage: Eastern United States and Canada (summer months)
Quick Reference: MDT to EDT
Remember: EDT is always 2 hours ahead of MDT. Both regions observe daylight saving time during the same period (March to November), so this 2-hour difference remains consistent throughout the daylight saving season.
Frequently Asked Questions
What is the time difference between MDT and EDT?
Mountain Daylight Time (MDT) is UTC-6, while Eastern Daylight Time (EDT) is UTC-4. This means EDT is 2 hours ahead of MDT. When it's 12:00 PM noon in Denver (MDT), it's 2:00 PM in New York (EDT).
When are MDT and EDT both active?
Both Mountain Daylight Time and Eastern Daylight Time are active during the same period: from the second Sunday in March to the first Sunday in November. This means the 2-hour time difference remains consistent throughout the entire daylight saving season.
What are the major cities in each timezone?
Mountain Daylight Time (MDT) covers cities like Denver, Salt Lake City, Albuquerque, and Boise. Eastern Daylight Time (EDT) covers major cities like New York, Boston, Atlanta, Miami, Philadelphia, and Washington DC. This conversion is crucial for coast-to-coast business operations.
How does the 2-hour difference affect business coordination?
The 2-hour difference requires careful meeting scheduling. Morning in Denver (8-10 AM MDT) is late morning in New York (10 AM-12 PM EDT). Afternoon in Denver (2-4 PM MDT) is late afternoon in New York (4-6 PM EDT). Both regions can find overlapping business hours, but it requires some coordination.
What are the best times to schedule calls between Mountain and East regions?
The optimal window is 10 AM-12 PM MDT (12 PM-2 PM EDT) when both regions are in mid-business day. Early morning Mountain meetings (8-9 AM MDT) work for late morning East Coast (10-11 AM EDT). Afternoon Mountain meetings (3-5 PM MDT) align with late afternoon East Coast (5-7 PM EDT).
Why is understanding this conversion important for US businesses?
The Mountain-East Coast corridor includes major business hubs (tech in Denver, finance in New York, tech and startups in Boston). Companies spanning these regions must understand the 2-hour difference for effective real-time collaboration, coast-to-coast product launches, and distributed team management.
Pro Tips
- • The 2-hour offset requires careful calendar planning - 10 AM MDT = 12 PM EDT is the ideal meeting window for both regions.
- • Morning Mountain meetings (9-10 AM MDT) work well for late morning East Coast (11 AM-12 PM EDT) start times.
- • Afternoon Mountain meetings (3-4 PM MDT) align with late afternoon East Coast (5-6 PM EDT) time slots.
- • Both regions transition on the same dates, so the 2-hour difference remains stable from March through November.
- • Denver and New York offices have good business hour overlap from 9 AM MDT (11 AM EDT) through 5 PM EDT (3 PM MDT).
- • For year-round coordination, remember the 2-hour difference shifts to MST-EST (also 2 hours) from November to March.
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