Greenwich Mean Time (GMT)
Greenwich Mean Time (GMT) is UTC+0. It is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year and does not change for daylight saving time.
The UK is on GMT only in winter; in summer it uses BST (UTC+1).
Convert GMT
Where GMT is used
Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
Countries on the same offsets
GMT and daylight saving time
Greenwich Mean Time does not change for daylight saving time. It stays on UTC+0 every day of the year.
Convert GMT to other time zones
GMT FAQ
What is GMT?
Greenwich Mean Time (GMT) is UTC+0. It is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year and does not change for daylight saving time.
What is the current GMT time?
GMT is UTC+0. The live clock on this page shows the current Greenwich Mean Time time, updated every second.
What is the difference between GMT and BST?
BST is one hour ahead of GMT. GMT is the standard time; BST is used during daylight saving time.
Which countries use GMT?
GMT is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
Updated 6 November 2026. Time zone data: IANA tz database.