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GMT: Greenwich Mean Time

GMT is UTC+0: the reference clock that every other offset is measured from. The United Kingdom and Ireland in winter, and all year in Iceland and several West African countries, including Ghana and Senegal.

Current time at UTC+0
GMT2:08 PMThu, Oct 22

Calculated from your device clock. Shown at the fixed GMT offset, whether or not a particular place is using it today.

Is GMT in use right now?

London switches between GMT and BST during the year.

Next change in London: Sunday, October 25, 2026, to UTC+0 (GMT). Based on time zone rules at build time.

Full name
Greenwich Mean Time
UTC offset
UTC+0ISO 8601: Z or +00:00
Type
Standard (winter) time
Summer counterpart
BST · UTC+1
Example IANA zone
Europe/London

Where and when GMT is used in 2026

Calculated for the cities in our directory from the IANA time zone database. Dates are local; each change happens in the early morning of the date shown.

CityIANA zoneOn GMT (UTC+0)
LondonEurope/LondonJan 1 – Mar 29 and Oct 25 – Dec 31
DublinEurope/DublinJan 1 – Mar 29 and Oct 25 – Dec 31

GMT conversion table

Every hour of the day in GMT, converted at fixed offsets. To convert local time in a specific city, use the city instead: its offset may change with the date.

GMT (UTC+0)EST (UTC−5)PST (UTC−8)CET (UTC+1)IST (UTC+5:30)JST (UTC+9)AEST (UTC+10)
12:00 AM7:00 PMprevious day4:00 PMprevious day1:00 AM5:30 AM9:00 AM10:00 AM
1:00 AM8:00 PMprevious day5:00 PMprevious day2:00 AM6:30 AM10:00 AM11:00 AM
2:00 AM9:00 PMprevious day6:00 PMprevious day3:00 AM7:30 AM11:00 AM12:00 PM
3:00 AM10:00 PMprevious day7:00 PMprevious day4:00 AM8:30 AM12:00 PM1:00 PM
4:00 AM11:00 PMprevious day8:00 PMprevious day5:00 AM9:30 AM1:00 PM2:00 PM
5:00 AM12:00 AM9:00 PMprevious day6:00 AM10:30 AM2:00 PM3:00 PM
6:00 AM1:00 AM10:00 PMprevious day7:00 AM11:30 AM3:00 PM4:00 PM
7:00 AM2:00 AM11:00 PMprevious day8:00 AM12:30 PM4:00 PM5:00 PM
8:00 AM3:00 AM12:00 AM9:00 AM1:30 PM5:00 PM6:00 PM
9:00 AM4:00 AM1:00 AM10:00 AM2:30 PM6:00 PM7:00 PM
10:00 AM5:00 AM2:00 AM11:00 AM3:30 PM7:00 PM8:00 PM
11:00 AM6:00 AM3:00 AM12:00 PM4:30 PM8:00 PM9:00 PM
12:00 PM7:00 AM4:00 AM1:00 PM5:30 PM9:00 PM10:00 PM
1:00 PM8:00 AM5:00 AM2:00 PM6:30 PM10:00 PM11:00 PM
2:00 PM9:00 AM6:00 AM3:00 PM7:30 PM11:00 PM12:00 AMnext day
3:00 PM10:00 AM7:00 AM4:00 PM8:30 PM12:00 AMnext day1:00 AMnext day
4:00 PM11:00 AM8:00 AM5:00 PM9:30 PM1:00 AMnext day2:00 AMnext day
5:00 PM12:00 PM9:00 AM6:00 PM10:30 PM2:00 AMnext day3:00 AMnext day
6:00 PM1:00 PM10:00 AM7:00 PM11:30 PM3:00 AMnext day4:00 AMnext day
7:00 PM2:00 PM11:00 AM8:00 PM12:30 AMnext day4:00 AMnext day5:00 AMnext day
8:00 PM3:00 PM12:00 PM9:00 PM1:30 AMnext day5:00 AMnext day6:00 AMnext day
9:00 PM4:00 PM1:00 PM10:00 PM2:30 AMnext day6:00 AMnext day7:00 AMnext day
10:00 PM5:00 PM2:00 PM11:00 PM3:30 AMnext day7:00 AMnext day8:00 AMnext day
11:00 PM6:00 PM3:00 PM12:00 AMnext day4:30 AMnext day8:00 AMnext day9:00 AMnext day

Highlighted rows: 9 am – 5 pm in GMT.

What to know about GMT

GMT and UTC show the same time, but GMT is the name of a civil time zone while UTC is the scientific reference. Calendar software normally prefers UTC.

London is not on GMT all year. From late March to late October the UK uses British Summer Time (BST), one hour ahead of GMT.

In Ireland, the summer clock is legally called Irish Standard Time and winter time is GMT. The clock readings match the UK.

Read more about why abbreviations need context and how daylight saving changes offsets.

Popular conversions

Local time in cities that use GMT

Other time zone abbreviations

All time zones →
UTCCoordinated Universal TimeUTC+0BSTBritish Summer TimeUTC+1CETCentral European TimeUTC+1CESTCentral European Summer TimeUTC+2ESTEastern Standard TimeUTC−5EDTEastern Daylight TimeUTC−4CSTCentral Standard Time (North America)UTC−6CDTCentral Daylight TimeUTC−5MSTMountain Standard TimeUTC−7PSTPacific Standard TimeUTC−8PDTPacific Daylight TimeUTC−7ISTIndia Standard TimeUTC+5:30JSTJapan Standard TimeUTC+9SGTSingapore TimeUTC+8GSTGulf Standard TimeUTC+4AESTAustralian Eastern Standard TimeUTC+10AEDTAustralian Eastern Daylight TimeUTC+11