10am in Irish Standard Time is 10am in Greenwich Mean Time.

Frequently asked

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

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

Irish Standard Time and Greenwich Mean Time are currently on the same time, so there is no difference to convert.

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

10am in Irish Standard Time is 10am in Greenwich Mean Time. Both sides are inside the standard 9-to-5 working day, so this is a sociable time for a call in both places. Use the hour-by-hour table above to read any other time across.

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

9am–5pm in Irish Standard Time lines up with 9am–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 — IST 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.