BST to GST Time Converter
GST is 3 hours ahead of BST. BST is UTC+1:00, and GST is UTC+4:00.
Best Time to Call Between BST and GST
Both zones are inside normal business hours between 9:00 AM and 2:00 PM BST — that's 12:00 PM to 5:00 PM GST. That's a 5-hour window.
both at work BST only GST only neither — hours along the strip are BST.
Common Times Converted
BST on the left, GST on the right.
BST to GST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | GST | Working hours |
|---|---|---|
| 12:00 AM | 3:00 AM | — |
| 1:00 AM | 4:00 AM | — |
| 2:00 AM | 5:00 AM | — |
| 3:00 AM | 6:00 AM | — |
| 4:00 AM | 7:00 AM | — |
| 5:00 AM | 8:00 AM | — |
| 6:00 AM | 9:00 AM | GST only |
| 7:00 AM | 10:00 AM | GST only |
| 8:00 AM | 11:00 AM | GST only |
| 9:00 AM | 12:00 PM | Both zones |
| 10:00 AM | 1:00 PM | Both zones |
| 11:00 AM | 2:00 PM | Both zones |
| 12:00 PM | 3:00 PM | Both zones |
| 1:00 PM | 4:00 PM | Both zones |
| 2:00 PM | 5:00 PM | BST only |
| 3:00 PM | 6:00 PM | BST only |
| 4:00 PM | 7:00 PM | BST only |
| 5:00 PM | 8:00 PM | — |
| 6:00 PM | 9:00 PM | — |
| 7:00 PM | 10:00 PM | — |
| 8:00 PM | 11:00 PM | — |
| 9:00 PM | 12:00 AM next day | — |
| 10:00 PM | 1:00 AM next day | — |
| 11:00 PM | 2:00 AM next day | — |
What BST and GST Actually Are
BST — British Summer Time
London, Manchester, Birmingham, Glasgow, and the rest of the UK from late March to late October. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
British Summer Time began in 1916 as a wartime fuel-saving measure and has run every year since, making it one of the oldest continuous daylight saving schemes in the world.
GST — Gulf Standard Time
Dubai, Abu Dhabi, Sharjah, Muscat. Standing at UTC+4:00 as written, and the region does not change its clocks, so that offset holds all year. GST also refers to South Georgia Time (UTC-2), which you are very unlikely to want.
The Gulf states have never observed daylight saving, so Dubai's offset has been unchanged for decades — unusual stability for a region that grew as fast as it did.
What This Means in Practice
This gap is not fixed
BST changes its clocks and GST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, October 25, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on BST
Cities on GST
Frequently Asked Questions
What is the time difference between BST and GST?
GST is 3 hours ahead of BST.
What is 9:00 AM BST in GST?
9:00 AM BST is 12:00 PM GST.
What are the best hours to schedule a call between BST and GST?
Between 9:00 AM and 2:00 PM BST, which is 12:00 PM to 5:00 PM GST. Both sides are inside normal business hours through that window.
Does the difference between BST and GST change during the year?
Yes. BST observes daylight saving and GST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
Does GST always mean Gulf Standard Time?
GST also refers to South Georgia Time (UTC-2), which you are very unlikely to want.