10am in Mountain Standard Time is 5pm in Greenwich Mean Time.

Frequently asked

Quick answers about converting between Mountain Standard Time and Greenwich Mean Time. Can't find what you need? Email [email protected].

What is the time difference between Mountain Standard Time and Greenwich Mean Time?

Mountain Standard Time is 7 hours behind Greenwich Mean Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 10am in Mountain Standard Time, what time is it in Greenwich Mean Time?

10am in Mountain Standard Time is 5pm in Greenwich Mean Time. That's already evening in Greenwich Mean Time, after the typical working day ends. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Mountain Standard Time and Greenwich Mean Time?

9am–10am in Mountain Standard Time lines up with 4pm–5pm in Greenwich Mean Time — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — MDT and BST — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.