MST to GMT Time Converter - Live World Clock

Convert time between Mountain Standard Time (MST) and Greenwich Mean Time (GMT). See current time with live clocks.

United States (MST)

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11:27:45 AM
Thursday, August 20, 2026

United Kingdom (GMT)

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06:27:45 PM
Thursday, August 20, 2026

Current Time Difference

MST is -7 hours behind GMT

(-7 hours during Daylight Saving Time)

What is MST (Mountain Standard Time)?

Mountain Standard Time (MST) used in western North America, UTC-7:00.

Countries and Regions Using MST

Primary Country:

  • United States
  • States: Colorado, Arizona, Utah, New Mexico

Also Used By:

  • Canada - Alberta
  • Mexico

Key Facts about MST:

  • ✓ Arizona doesn't observe DST
  • ✓ Major mountain resort areas
  • ✓ Growing tech hub in Denver
  • ✓ Major Cities: Denver, Phoenix, Albuquerque, Salt Lake City
  • ✓ UTC Offset: -7:00 (-6:00 during MDT)

What is GMT (Greenwich Mean Time)?

Greenwich Mean Time (GMT) is the reference point for world time zones, UTC+0:00.

Countries and Regions Using GMT

Primary Country:

  • United Kingdom

Also Used By:

  • Ireland
  • Portugal

Key Facts about GMT:

  • ✓ Prime meridian reference point
  • ✓ London financial center
  • ✓ Historical timekeeping standard
  • ✓ Major Cities: London, Manchester, Birmingham, Leeds, Glasgow
  • ✓ UTC Offset: +0:00 (+1:00 during BST)

MST to GMT Time Difference

Standard Time Difference:

MST is -7 hours behind

During Daylight Saving Time:

MST is -7 hours behind

Common Use Cases:

  • • Business meetings between United States and United Kingdom
  • • International collaboration across timezones
  • • Scheduling calls and conferences

Frequently Asked Questions

Which countries are in MST time zone?

United States is the primary country using MST (-7:00). Other countries include: Canada, Mexico.

Which countries are in GMT time zone?

United Kingdom is the primary country using GMT (+0:00). Other countries include: Ireland, Portugal.

How many hours is MST ahead of GMT?

MST is -7 hours behind GMT. During Daylight Saving Time, the difference is -7 hours.

Does United States observe Daylight Saving Time?

Yes, United States observes Daylight Saving Time. During DST, MST changes to MDT (Mountain Daylight Time) with UTC offset of -6:00.