GMT: Greenwich Mean Time
Greenwich Mean Time (UTC+0)
Wednesday, 11th November 2026
What GMT actually is
GMT and UTC show the same clock time. GMT is the older, astronomical name; UTC is the atomic-clock standard that replaced it in 1972.
Careful: Greenwich Mean Time (UTC+0) is not on GMT at the moment. It is currently UTC (UTC+0) because of daylight saving.
GMT means 2 different things
This is the whole reason calendar software uses IANA identifiers instead of abbreviations. All of them, live:
Greenwich Mean Time (UTC+0)
GMT and UTC show the same clock time. GMT is the older, astronomical name; UTC is the atomic-clock standard that replaced it in 1972.
Clocks here do not change: this zone stays on the same offset all year.
UK winter time
The UK is on GMT from late October to late March, then moves to British Summer Time (BST, UTC+1). "GMT" and "London time" are only the same thing for five months of the year.
Clocks go forward 1 hour on Sunday, 28th March 2027, at 12:59 am local time (2:00 am after the change).
Convert GMT
Looking for UTC and GMT developer tooling (epoch conversion, ISO 8601, a free time API)? That lives on our sibling site utctime.app.
Other abbreviations
Questions people ask
What time is it in GMT right now?
12:25 pm (12:25) on Wednesday, 11th November 2026, for Greenwich Mean Time (UTC+0). Careful: GMT means 2 different things. The other meanings and their current times are listed below.
What does GMT stand for?
Greenwich Mean Time. GMT and UTC show the same clock time. GMT is the older, astronomical name; UTC is the atomic-clock standard that replaced it in 1972.
What is the UTC offset of GMT?
Greenwich Mean Time (UTC+0): UTC+0; UK winter time: UTC+0.
Why does GMT mean more than one time zone?
Time-zone abbreviations were never standardised: several countries independently picked the same letters. GMT is one of the worst offenders, with 2 meanings in current use. This is why calendar software and databases use IANA identifiers like UTC instead: they are unique, and they carry the daylight-saving rules with them.