MDT to MSK Converter
Convert time between Mountain Daylight Time (MDT) and Moscow Standard Time (MSK)
Mountain Daylight Time (MDT)
Moscow Standard Time (MSK)
Time Difference
Moscow Standard Time (MSK) is 0 hours ahead of Mountain Daylight Time (MDT)
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Quick Reference
| MDT | MSK |
|---|---|
| 19:00 | 05:00 |
| 21:00 | 07:00 |
| 23:00 | 09:00 |
| 01:00 | 11:00 |
| 03:00 | 13:00 |
| 05:00 | 15:00 |
| 07:00 | 17:00 |
| 09:00 | 19:00 |
| 11:00 | 21:00 |
| 13:00 | 23:00 |
| 15:00 | 01:00 |
| 17:00 | 03:00 |
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 MSK Time Conversion
Converting time between Mountain Daylight Time (MDT) and Moscow Standard Time (MSK) is essential for coordinating business operations between the US Mountain region and Russia. MDT is UTC-6 (used March to November), while MSK is UTC+3 (used year-round without daylight saving time). MSK is 9 hours ahead of MDT during summer months.
This conversion is important for companies with tech outsourcing, business partnerships, or operations spanning Denver, Salt Lake City, and Moscow or other Russian cities. Unlike many other regions, Russia does not observe daylight saving time, so MSK remains constant throughout the year. The time difference changes to 10 hours during winter months when the US Mountain region switches to Mountain Standard Time (MST).
Common Use Cases for MDT to MSK Conversion
Business & Work
- Scheduling meetings between US Mountain region and Moscow tech teams
- Coordinating software development outsourcing with Russian companies
- Managing business operations with Moscow-based partners and clients
- Planning conference calls and negotiations with Russian counterparts
Personal & Travel
- Coordinating with family and friends in Moscow and Russia
- Planning travel between Mountain US and Russia
- Scheduling virtual meetings with Russian contacts and colleagues
- Arranging online collaboration with Moscow-based team members
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 (summer months)
Moscow Standard Time (MSK)
- UTC Offset: UTC+3 (year-round)
- IANA Timezone: Europe/Moscow
- Daylight Saving: No daylight saving time - MSK remains constant throughout the year
- Major Cities: Moscow, St. Petersburg, Kazan, Ekaterinburg (uses YEKT, UTC+5)
- Coverage: Moscow and Western Russia (year-round)
Quick Reference: MDT to MSK
MSK is 9 hours ahead of MDT during summer months (April-October). During winter months (November-March), when the US Mountain region switches to MST (UTC-7), the difference increases to 10 hours. Russia does not observe daylight saving time, so MSK remains constant year-round at UTC+3.
Frequently Asked Questions
What is the time difference between MDT and MSK?
Mountain Daylight Time (MDT) is UTC-6, while Moscow Standard Time (MSK) is UTC+3. This means MSK is 9 hours ahead of MDT. When it's 9:00 AM in Denver (MDT), it's 6:00 PM the same day in Moscow (MSK).
Why is Moscow on MSK year-round?
Russia does not observe daylight saving time. Moscow maintains Moscow Standard Time (MSK, UTC+3) throughout the entire year. This is in contrast to the US Mountain region, which switches between MDT (summer) and MST (winter), creating varying time differences.
What is the time difference between MDT and Moscow in winter?
During winter months (November to March), the US Mountain region operates on Mountain Standard Time (MST, UTC-7), while Moscow remains on MSK (UTC+3). This creates a 10-hour difference, with Moscow 10 hours ahead of Denver.
What are the best times for MDT-MSK business calls?
With a 9-hour difference during summer (MDT), overlap is limited. Early morning MDT (6-8 AM) corresponds to afternoon MSK (3-5 PM) - your best window. Morning MDT (9-10 AM) catches MSK evening (6-7 PM). After 10 AM MDT, Muscovites are typically off work. During winter (MST), these times shift one hour later.
How does the MDT-MSK offset affect tech outsourcing?
The 9-hour gap (summer) or 10-hour gap (winter) requires careful scheduling for real-time collaboration. Many US Mountain teams use early morning shifts (6-9 AM MDT) to overlap with Moscow afternoon hours (3-6 PM MSK). Asynchronous communication is essential for non-urgent matters due to the significant time difference.
When do I need to adjust for the MST-MSK difference?
The time difference increases from 9 to 10 hours on the second Sunday in March when the US Mountain region switches from MST (winter) to MDT (summer). Conversely, it decreases from 10 to 9 hours on the first Sunday in November when MDT ends and MST begins. Moscow's time does not change.
Pro Tips
- • The 9-hour MDT to MSK gap is consistent April-October. Plan recurring meetings for early MDT mornings (6-8 AM) to catch Moscow afternoons (3-5 PM).
- • Denver 7 AM MDT = Moscow 4 PM MSK - the sweet spot for productive business discussions when both teams are alert.
- • Moscow end of day (5-6 PM MSK) corresponds to 8-9 AM MDT - ideal for wrap-up syncs and status updates.
- • During winter months (November-March), add one hour to all MSK times: 8 AM MDT = 6 PM MSK (one hour later than summer).
- • Russia does not observe daylight saving time - only your Mountain region time changes seasonally, affecting the offset.
- • For daily standups, 6 AM MDT (3 PM MSK) works well - early but manageable for Mountain teams, mid-afternoon for Moscow staff.
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