What is the difference between UTC and GMT?

GMT is the same time of UTC. UTC means Coordinated Universal Time at UTC+0, and GMT means Greenwich Mean Time at UTC+0.

Which time zone does this page use for UTC?

UTC. An abbreviation is not a time zone — it is a label a zone wears for part of the year — so every calculation here uses a named IANA zone and says which one. If you are writing code, use UTC rather than the string "UTC".

Does GMT mean anything else?

Yes: United Kingdom local time in winter at UTC+0. Britain is on GMT only from late October to late March; the rest of the year it is on BST, an hour ahead.

Is UTC a daylight saving abbreviation?

No. UTC is the standard-time abbreviation. When daylight saving is in force, the same zone uses a different one.

UTC to GMT

GMT is the same time of UTC: UTC is UTC+0 and GMT is UTC+0.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Computed on a date when UTC is genuinely in force — using today would be wrong for half the year, because a standard-time abbreviation does not exist in summer.

UTC	GMT
00:00	00:00
01:00	01:00
02:00	02:00
03:00	03:00
04:00	04:00
05:00	05:00
06:00	06:00
07:00	07:00
08:00	08:00
09:00	09:00
10:00	10:00
11:00	11:00
12:00	12:00
13:00	13:00
14:00	14:00
15:00	15:00
16:00	16:00
17:00	17:00
18:00	18:00
19:00	19:00
20:00	20:00
21:00	21:00
22:00	22:00
23:00	23:00

What these abbreviations actually are

	UTC	GMT
Full name	Coordinated Universal Time	Greenwich Mean Time
Representative zone	UTC	Etc/GMT
Offset	UTC+0	UTC+0
Seasonal	Standard time	Standard time
Zone changes in 2026	0	0
Other meanings	None in common use	1

Common questions

What is the difference between UTC and GMT?: GMT is the same time of UTC. UTC means Coordinated Universal Time at UTC+0, and GMT means Greenwich Mean Time at UTC+0.
Which time zone does this page use for UTC?: UTC. An abbreviation is not a time zone — it is a label a zone wears for part of the year — so every calculation here uses a named IANA zone and says which one. If you are writing code, use UTC rather than the string "UTC".
Does GMT mean anything else?: Yes: United Kingdom local time in winter at UTC+0. Britain is on GMT only from late October to late March; the rest of the year it is on BST, an hour ahead.
Is UTC a daylight saving abbreviation?: No. UTC is the standard-time abbreviation. When daylight saving is in force, the same zone uses a different one.