UTC to GMT to London Time Converter
The United Kingdom is on summer time: BST (UTC+1) until Sun, Oct 25.
Iceland and Ghana stay on GMT (UTC+0).
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
12:00 pm12:00 UTC (UTC+0), Oct 18, 2026 = 12:00 pm12:00 GMT (UTC+0), Oct 18, 2026 = 1:00 pm13:00 BST (UTC+1), Oct 18, 2026
UTC and GMT have the same local time. UTC is 1 hour behind London.
How the time difference changes
UTC to GMT
UTC and GMT have the same time year-round.
Working hours of 9:00 am to 6:00 pm in UTC correspond to 9:00 am to 6:00 pm in GMT.Working hours of 09:00 to 18:00 in UTC correspond to 09:00 to 18:00 in GMT.
UTC to London
For most of the year, UTC is 1 hour behind London. From Oct 25, 2026 to Mar 28, 2027, UTC and London have the same time.
For most of the year, working hours of 9:00 am to 6:00 pm in UTC correspond to 10:00 am to 7:00 pm in London. At other times of the year, working hours of 9:00 am to 6:00 pm in UTC correspond to 9:00 am to 6:00 pm in London.For most of the year, working hours of 09:00 to 18:00 in UTC correspond to 10:00 to 19:00 in London. At other times of the year, working hours of 09:00 to 18:00 in UTC correspond to 09:00 to 18:00 in London.
Compare UTC time with GMT and London time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Coordinated Universal Time and Greenwich Mean Time have the same local time. Coordinated Universal Time is 1 hour behind BST (British Summer Time).
12:00 pm12:00 in UTC is 12:00 pm12:00 in GMT and is 1:00 pm13:00 in London, United Kingdom
UTC to GMT call time
Best time for a conference call or a meeting is between 9am-6pm09:00-18:00 in UTC which corresponds to 9am-6pm09:00-18:00 in GMT
UTC to London call time
Best time for a conference call or a meeting is between 9am-5pm09:00-17:00 in UTC which corresponds to 10am-6pm10:00-18:00 in London
12:00 pm12:00 Coordinated Universal Time (UTC). Offset UTC 0:00 hours
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
1:00 pm13:00 BST (British Summer Time) (London, United Kingdom). Offset UTC +1:00 hour
12:00 pm12:00 UTC / 12:00 pm12:00 GMT / 1:00 pm13:00 London, United Kingdom
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| UTC | GMT | London, United Kingdom |
|---|---|---|
| 12:00am | 1:00am | |
| 1:00am | 2:00am | |
| 2:00am | 3:00am | |
| 3:00am | 4:00am | |
| 4:00am | 5:00am | |
| 5:00am | 6:00am | |
| 6:00am | 7:00am | |
| 7:00am | 8:00am | |
| 8:00am | 9:00am | |
| 9:00am | 10:00am | |
| 10:00am | 11:00am | |
| 11:00am | 12:00pm | |
| 12:00pm | 1:00pm | |
| 1:00pm | 2:00pm | |
| 2:00pm | 3:00pm | |
| 3:00pm | 4:00pm | |
| 4:00pm | 5:00pm | |
| 5:00pm | 6:00pm | |
| 6:00pm | 7:00pm | |
| 7:00pm | 8:00pm | |
| 8:00pm | 9:00pm | |
| 9:00pm | 10:00pm | |
| 10:00pm | 11:00pm | |
| 11:00pm | 12:00am next day | |
| 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 | 00:00 next day |
Coordinated Universal Time
Offset: UTC is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Antarctica, Burkina Faso, Faroe Islands, Gambia, Ghana, Greenland, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Morocco, Portugal, Saint Helena, São Tomé and Príncipe, Senegal, Sierra Leone, Spain, Togo, United Kingdom, Western Sahara
Principal Cities: The largest city in the UTC time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Casablanca, Dakar.
Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is the successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but UTC is the standard the scientific community uses.
UTC has been the time standard commonly used across the world since 1972. It is used in many technical fields, such as aviation and meteorology, and to synchronize time across internet networks.
Today some of the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time, WEST).
UTC representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for UTC
- Z - short form of 'Zulu'
- Etc/UCT
- Etc/UTC
- Etc/Universal
- Etc/Zulu
- UCT
- UTC
- Universal
- Zulu
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone
Greenwich Mean Time
Offset: GMT is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Antarctica, Burkina Faso, Gambia, Ghana, Greenland, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Morocco, Saint Helena, São Tomé and Príncipe, Senegal, Sierra Leone, Togo, United Kingdom, Western Sahara
Principal Cities: The largest city in the GMT time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Casablanca, Dakar.
Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use the two are the same. In the military, GMT is known as Zulu time. Greenwich Mean Time was the same as Universal Time (UT), a standard astronomical concept used in many technical fields, until the introduction of UTC in 1972.
Today the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time).
GMT representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Conakry
- Africa/Dakar
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
- Africa/Nouakchott
- Africa/Ouagadougou
- Africa/Sao_Tome
- Africa/Timbuktu
- America/Danmarkshavn
- Atlantic/Reykjavik
- Atlantic/St_Helena
- Eire
- Etc/GMT
- Etc/GMT+0
- Etc/GMT-0
- Etc/GMT0
- Etc/Greenwich
- Europe/Belfast
- Europe/Dublin
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- GMT
- GMT+0
- GMT-0
- GMT0
- Greenwich
- Iceland
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone
London Time Zone and Facts
Time Zone
GMT – Greenwich Mean Time, UTC+0 (standard time)