Saint Helena, Ascension and Tristan da Cunha is 1 hour behind Greenwich Mean Time.

Frequently asked

Quick answers about converting between Saint Helena, Ascension and Tristan da Cunha and Greenwich Mean Time. Can't find what you need? Email [email protected].

What is the time difference between Saint Helena, Ascension and Tristan da Cunha and Greenwich Mean Time?

Saint Helena, Ascension and Tristan da Cunha is 1 hour 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 9am in Saint Helena, Ascension and Tristan da Cunha, what time is it in Greenwich Mean Time?

9am in Saint Helena, Ascension and Tristan da Cunha is 10am in Greenwich Mean Time. Use the hour-by-hour table above to read any other time across — find the row and read the matching cell in the other column.

What's the best time for a call between Saint Helena, Ascension and Tristan da Cunha and Greenwich Mean Time?

9am–4pm in Saint Helena, Ascension and Tristan da Cunha lines up with 10am–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 — GMT 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.