See the live UTC time next to the current time in the United Kingdom, check today's real offset, and roll through any UTC time to find the matching GMT/BST time — including when the two zones fall on different dates.
United Kingdom Time
Coordinated Universal Time
US Eastern Time
THE CLOCKS ABOVE ALWAYS SHOW THE LIVE CURRENT TIME. THE ROLLER BELOW IS A LOOKUP TOOL — ROTATING IT NEVER CHANGES THEM.
GMT/BST is 1 hour ahead of UTC
ET is 5 hours behind UTC
United Kingdom is 6 hours ahead of United States (Eastern)
| UTC | GMT/BST | Date |
|---|---|---|
| 00:00 | 01:00 | Same day |
| 01:00 | 02:00 | Same day |
| 02:00 | 03:00 | Same day |
| 03:00 | 04:00 | Same day |
| 04:00 | 05:00 | Same day |
| 05:00 | 06:00 | Same day |
| 06:00 | 07:00 | Same day |
| 07:00 | 08:00 | Same day |
| 08:00 | 09:00 | Same day |
| 09:00 | 10:00 | Same day |
| 10:00 | 11:00 | Same day |
| 11:00 | 12:00 | Same day |
| 12:00 | 13:00 | Same day |
| 13:00 | 14:00 | Same day |
| 14:00 | 15:00 | Same day |
| 15:00 | 16:00 | Same day |
| 16:00 | 17:00 | Same day |
| 17:00 | 18:00 | Same day |
| 18:00 | 19:00 | Same day |
| 19:00 | 20:00 | Same day |
| 20:00 | 21:00 | Same day |
| 21:00 | 22:00 | Same day |
| 22:00 | 23:00 | Same day |
| 23:00 | 00:00 | Next day in United Kingdom |
Coordinated Universal Time (UTC) is the world's time standard: it never shifts for seasons and every other zone is described as an offset from it. United Kingdom Time (GMT/BST) is the clock used in the United Kingdom. Converting UTC to GMT/BST means adding that offset to the UTC reading.
Greenwich Mean Time is measured at the Royal Observatory in Greenwich and is the historical basis for the modern UTC standard.
Take the UTC time, apply the current GMT/BST offset shown in the live panel above, and roll the date forward or back if the result crosses midnight. The interactive roller does all three steps for you: the left drum is UTC, the right drum is GMT/BST, and a day badge appears whenever the local date differs.
Because GMT/BST observes daylight saving time, the gap to UTC is not fixed — every clock and table on this page is calculated live from the Europe/London IANA database, so today's real offset is always what you see.
The reference table below the tool lists every UTC half hour against the matching GMT/BST time for today, so you can copy a conversion without touching the roller.
The UK switches between GMT (UTC +00:00) in winter and British Summer Time (UTC +01:00) from late March to late October, so UTC and London time are only identical for part of the year.