GST to BST time conversion
BST is 3 hours behind GST.
Time difference with your location
GST is 4 hours ahead of UTC. Compare with your local time →
Choose a date and time
Choose the local time in GST to convert it to BST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · GST → BST
This table converts each hour in GST to BST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| GST | BST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 21:009:00 PM -1 day | |
| 01:001:00 AM | 22:0010:00 PM -1 day | |
| 02:002:00 AM | 23:0011:00 PM -1 day | |
| 03:003:00 AM | 00:0012:00 AM | |
| 04:004:00 AM | 01:001:00 AM | |
| 05:005:00 AM | 02:002:00 AM | |
| 06:006:00 AM | 03:003:00 AM | |
| 07:007:00 AM | 04:004:00 AM | |
| 08:008:00 AM | 05:005:00 AM | |
| 09:009:00 AM | 06:006:00 AM | |
| 10:0010:00 AM | 07:007:00 AM | |
| 11:0011:00 AM | 08:008:00 AM | ✓ |
| 12:0012:00 PM | 09:009:00 AM | ✓ |
| 13:001:00 PM | 10:0010:00 AM | ✓ |
| 14:002:00 PM | 11:0011:00 AM | ✓ |
| 15:003:00 PM | 12:0012:00 PM | ✓ |
| 16:004:00 PM | 13:001:00 PM | ✓ |
| 17:005:00 PM | 14:002:00 PM | ✓ |
| 18:006:00 PM | 15:003:00 PM | |
| 19:007:00 PM | 16:004:00 PM | |
| 20:008:00 PM | 17:005:00 PM | |
| 21:009:00 PM | 18:006:00 PM | |
| 22:0010:00 PM | 19:007:00 PM | |
| 23:0011:00 PM | 20:008:00 PM |
Quick conversion examples
These examples use GST (UTC+4) and BST (UTC+1); choosing a date applies the local clock changes.
Conversion formula: BST = GST − 3h · GMT = GST − 4h.
| GST | BST |
|---|---|
| 6:00 AM GST | = 3:00 AM BST |
| 7:00 AM GST | = 4:00 AM BST |
| 8:00 AM GST | = 5:00 AM BST |
| 9:00 AM GST | = 6:00 AM BST |
| 10:00 AM GST | = 7:00 AM BST |
| 12:00 PM GST | = 9:00 AM BST |
| 3:00 PM GST | = 12:00 PM BST |
| 5:00 PM GST | = 2:00 PM BST |
| 6:00 PM GST | = 3:00 PM BST |
| 8:00 PM GST | = 5:00 PM BST |
Overlapping meeting hours
The 08:00–18:00 working day in GST and BST overlaps for 7 hours on 2026-10-21.
- Shared working hours
- 11:00–18:00 GST · 08:00–15:00 BST
Clock changes on both sides, 2026–2028
GST and BST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | GST | BST |
|---|---|---|
| 2026 | No clock changes; UTC+4 all year. | · 01:00 → 02:00 · 02:00 → 01:00 |
| 2027 | No clock changes; UTC+4 all year. | · 01:00 → 02:00 · 02:00 → 01:00 |
| 2028 | No clock changes; UTC+4 all year. | · 01:00 → 02:00 · 02:00 → 01:00 |
At the start of 2026, GMT is 4 hours behind GST. The difference changes during the following periods.
- From 2026-03-29 05:00 GST until 2026-10-25 05:00 GST, BST is 3 hours behind GST.
- From 2027-03-28 05:00 GST until 2027-10-31 05:00 GST, BST is 3 hours behind GST.
- From 2028-03-26 05:00 GST until 2028-10-29 05:00 GST, BST is 3 hours behind GST.
Frequently asked questions
What time is 9 AM GST in BST?
9:00 AM GST = 6:00 AM BST, using UTC+4 and UTC+1. Choose a date above for the seasonal local time.
Does the time difference between GST and BST change during the year?
Yes. During 2026–2028: BST is 4 hours behind GST; BST is 3 hours behind GST. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in BST?
Read the UTC+1 clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between GST and BST?
The shared 08:00–18:00 working window is 11:00–18:00 GST / 08:00–15:00 UTC+1, a total of 7 hours.
What is the time difference between GST and BST now?
Right now, UTC+1 is 3 hours behind GST. Conversion formula: BST = GST − 3h · GMT = GST − 4h.