1am UTC is 2:00 am BST
1am UTC is 2:00 am BST in UK Time. BST is 1 hour ahead of UTC today, and that gap changes during the year, so this is recomputed rather than assumed.
What time is 1am UTC in BST?
It is 2:00 am. UK is 1 hour ahead of UTC, so you add 1 hour to 1:00 am and the date does not change. 1am is the small hours in UTC, the deadest part of the night, while 2:00 am is the small hours in UK, the deadest part of the night.
Spoken as military time, 1am is 0100 hours and the result is 0200 hours. The military convention exists precisely because "3 o'clock" is ambiguous twice over: once on the 12 hour clock and once across zones.
1am UTC to BST in the hours either side
The four hours before and after 1am, in case the meeting moves. Note that the calendar date does not stay put across this window: it changes partway through, which is exactly where scheduling mistakes come from.
| UTC | BST | BST date | Working hours |
|---|---|---|---|
| 9:00 pm | 10:00 pm | same day | neither |
| 10:00 pm | 11:00 pm | same day | neither |
| 11:00 pm | 12:00 am | the next day | neither |
| 12:00 am | 1:00 am | same day | neither |
| 1:00 am (this page) | 2:00 am | same day | neither |
| 2:00 am | 3:00 am | same day | neither |
| 3:00 am | 4:00 am | same day | neither |
| 4:00 am | 5:00 am | same day | neither |
| 5:00 am | 6:00 am | same day | neither |
Is 1am UTC a good time to call BST?
No. 2:00 am in UK is the small hours, the deadest part of the night. Nobody is taking that call. The zones are 1 hour apart, so the nearest sensible slot is a different hour entirely.
Does daylight saving change 1am UTC to BST?
Yes. Sampled at 1am on every day of 2026, the gap takes 2 different values. Today it is 1 hour, which is why the answer above is dated rather than fixed.
Coordinated Universal Time does not move its clocks at all, so its UTC+0 offset holds every day of the year.
UK Time is currently on BST and changes next on Sunday, October 25, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC+1 to UTC+0.
1am BST to UTC, the other way round
Running the question the other way is a different conversion, not a mirror image, because the two zones can be in different daylight saving states on the same date. 1am BST is 12:00 am UTC, which is a different reading from the answer above, because the two directions are separate questions. One wrinkle worth knowing: GMT and BST are two names for the same zone, not two zones. UK Time reads GMT in winter and BST in summer. When somebody types "utc to bst" they nearly always mean the zone rather than the literal winter offset, so this page resolves UTC to Etc/UTC and BST to Europe/London and applies whichever offset is genuinely in force on the day.
Questions
- What is 1am UTC in BST?
- 2:00 am BST.
- Does 1am UTC cross into another date in BST?
- No. It stays on the same calendar day, September 23, 2026.
- Is 1am UTC always 2am BST?
- No. The gap moves during the year, between no difference and 1 hour. Today it is 1 hour.
- How is 1am UTC written in 24 hour time?
- 01:00, and the answer in BST is 02:00.
- Can I call UK at that hour?
- 2:00 am is outside the 9 to 5 working day in UK.
Other hours on this pair
UTC to BST full conversion table · BST to UTC · 1am BST to UTC · All timezone conversions
12 and 24 hour converter · 8 hours from now · Today · Day counter