EST to MST Converter
Convert time between Eastern Standard Time (EST) and Mountain Standard Time (MST)
Eastern Standard Time (EST)
Mountain Standard Time (MST)
Time Difference
Mountain Standard Time (MST) is 0 hours ahead of Eastern Standard Time (EST)
Select Date
Select Time
Quick Reference
| EST | MST |
|---|---|
| 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 EST to MST Time Conversion
Converting time between Eastern Standard Time (EST) and Mountain Standard Time (MST) is essential for coordinating activities across these North American time zones. EST is UTC-5, while MST is UTC-7, making MST 2 hours behind EST.
This time zone converter uses the IANA timezone database to ensure accurate calculations, accounting for daylight saving time transitions and regional variations. Whether you're scheduling business meetings, planning travel, or coordinating with teams across time zones, our converter provides reliable results.
Common Use Cases for EST to MST Conversion
Business & Work
- Scheduling meetings between East Coast and Mountain regions
- Coordinating project deadlines across time zones
- Planning conference calls and webinars
Personal & Travel
- Planning travel itineraries and flight connections
- Coordinating with family and friends in different time zones
- Scheduling virtual events and online activities
Time Zone Information
Eastern Standard Time (EST)
- UTC Offset: UTC-5 (UTC-4 during EDT)
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Philadelphia, Atlanta, Miami, Boston
- Coverage: Eastern United States and Canada
Mountain Standard Time (MST)
- UTC Offset: UTC-7 (UTC-6 during MDT)
- IANA Timezone: America/Denver
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Denver, Salt Lake City, Albuquerque, Boise
- Coverage: Mountain United States and parts of Canada
Quick Reference: EST to MST
Remember: MST is always 2 hours behind EST