GMT to BST Time Converter

British Summer Time (BST) is currently 1 hour ahead of Greenwich Mean Time (GMT). GMT is UTC+0 and BST is UTC+1. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.

Greenwich Mean Time (GMT)

--:--:--

(UTC+0)

British Summer Time (BST)

--:--:--

(UTC+1)

Best Time for a Call

Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 4:00 PM in GMT, which is 10:00 AM to 5:00 PM in BST.

Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.

Hour by Hour: GMT to BST

GMTBST

12:00 AM1:00 AM

1:00 AM2:00 AM

2:00 AM3:00 AM

3:00 AM4:00 AM

4:00 AM5:00 AM

5:00 AM6:00 AM

6:00 AM7:00 AM

7:00 AM8:00 AM

8:00 AM9:00 AM

9:00 AM10:00 AMoffice hours

10:00 AM11:00 AMoffice hours

11:00 AM12:00 PMoffice hours

12:00 PM1:00 PMoffice hours

1:00 PM2:00 PMoffice hours

2:00 PM3:00 PMoffice hours

3:00 PM4:00 PMoffice hours

4:00 PM5:00 PMoffice hours

5:00 PM6:00 PM

6:00 PM7:00 PM

7:00 PM8:00 PM

8:00 PM9:00 PM

9:00 PM10:00 PM

10:00 PM11:00 PM

11:00 PM12:00 AM+1 day

Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.

Does the Difference Change During the Year?

GMT and BST are fixed offsets, so the difference between them never changes.

GMT is UTC+0 and never shifts. The UK is on GMT in winter but moves to BST (UTC+1) from late March to late October.

BST is UTC+1, used in the UK from late March to late October. In winter the UK is on GMT. BST can also refer to Bangladesh Standard Time, which is UTC+6.

Frequently Asked Questions

How many hours ahead is BST compared to GMT?

BST is currently 1 hour ahead of GMT. GMT and BST are fixed offsets, so the difference between them never changes.

What time is 9:00 AM in GMT in BST?

9:00 AM in GMT is 10:00 AM in BST.

What is the best time for a call between GMT and BST?