Convert GMT to UTC
GMT
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UTC
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UTC is level with GMT in winter and 1 hour behind BST in summer. GMT is London time, GMT at UTC+0 in winter and BST at UTC+1 in summer. UTC is Coordinated Universal Time, the UTC+0 reference every other zone is measured from. Paste a Unix timestamp, an ISO 8601 string or a plain date such as June 1 2026 3:00 pm and the converter shows that moment in both zones, with UTC and Unix time alongside.
GMT to UTC at a glance
| GMT | Winter (GMT) | Summer (BST) |
|---|---|---|
| 00:00 | 00:00 | 23:00 -1d |
| 06:00 | 06:00 | 05:00 |
| 09:00 | 09:00 | 08:00 |
| 12:00 | 12:00 | 11:00 |
| 15:00 | 15:00 | 14:00 |
| 18:00 | 18:00 | 17:00 |
| 21:00 | 21:00 | 20:00 |
In 2026, clocks in London change on 29 March and 25 October. UTC does not change.
Common questions
- What is the time difference between GMT and UTC?
- UTC is level with GMT in winter and 1 hour behind BST in summer. The table on this page lists common GMT hours with their UTC equivalents, and the converter gives the exact gap for any date you enter.
- What time is it in UTC right now?
- The UTC panel at the top of the page shows the current local time there, next to GMT, so you can compare at a glance. The offset line under it reports the gap for this moment, so you do not have to work out which side of a clock change you are on.
- How do I convert a specific GMT time to UTC?
- Type the GMT time into the box and the panel shows the same moment in UTC. For example, 09:00 in GMT on 1 June 2026 is 08:00 the same day in UTC. A time with no zone is read as GMT on this page; the selector under the box switches that to UTC or to your own zone, and a Unix number or an ISO 8601 string with an offset is always read as written.
- Does the GMT to UTC difference change with daylight saving time?
- Yes, twice. London moves its clocks on 29 March and 25 October in 2026, while UTC stays at UTC+0 all year, so the gap changes by an hour on each of those dates. parsetime computes the offset for the exact instant you enter, so the days around a change come out right as well.