London to GMT to UTC 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
1:00 pm13:00 BST (UTC+1), Oct 18, 2026 = 12:00 pm12:00 GMT (UTC+0), Oct 18, 2026 = 12:00 pm12:00 UTC (UTC+0), Oct 18, 2026
London is 1 hour ahead of GMT. London is 1 hour ahead of UTC.
How the time difference changes
London to GMT
For most of the year, London is 1 hour ahead of GMT. From Oct 25, 2026 to Mar 28, 2027, London and GMT have the same time.
For most of the year, working hours of 9:00 am to 6:00 pm in London correspond to 8:00 am to 5:00 pm in GMT. At other times of the year, working hours of 9:00 am to 6:00 pm in London correspond to 9:00 am to 6:00 pm in GMT.For most of the year, working hours of 09:00 to 18:00 in London correspond to 08:00 to 17:00 in GMT. At other times of the year, working hours of 09:00 to 18:00 in London correspond to 09:00 to 18:00 in GMT.
London to UTC
For most of the year, London is 1 hour ahead of UTC. From Oct 25, 2026 to Mar 28, 2027, London and UTC have the same time.
For most of the year, working hours of 9:00 am to 6:00 pm in London correspond to 8:00 am to 5:00 pm in UTC. At other times of the year, working hours of 9:00 am to 6:00 pm in London correspond to 9:00 am to 6:00 pm in UTC.For most of the year, working hours of 09:00 to 18:00 in London correspond to 08:00 to 17:00 in UTC. At other times of the year, working hours of 09:00 to 18:00 in London correspond to 09:00 to 18:00 in UTC.
Compare London time with GMT and UTC time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
BST (British Summer Time) is 1 hour ahead of Greenwich Mean Time. BST (British Summer Time) is 1 hour ahead of Coordinated Universal Time.
1:00 pm13:00 in London, United Kingdom is 12:00 pm12:00 in GMT and is 12:00 pm12:00 in UTC
London to GMT call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in London which corresponds to 9am-5pm09:00-17:00 in GMT
London to UTC call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in London which corresponds to 9am-5pm09:00-17:00 in UTC
1:00 pm13:00 BST (British Summer Time) (London, United Kingdom). Offset UTC +1:00 hour
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
12:00 pm12:00 Coordinated Universal Time (UTC). Offset UTC 0:00 hours
1:00 pm13:00 London, United Kingdom / 12:00 pm12:00 GMT / 12:00 pm12:00 UTC
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.
| London, United Kingdom | GMT | UTC |
|---|---|---|
| 11:00pm previous day | 11:00pm previous day | |
| 12:00am | 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 | |
| 23:00 previous day | 23:00 previous day | |
| 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 |
London Time Zone and Facts
Time Zone
GMT – Greenwich Mean Time, UTC+0 (standard time)
London Facts
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
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