GMT to BMT 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 GMT (UTC+0), Oct 18, 2026 = 1:00 pm13:00 BMT (UTC+1), Oct 18, 2026
GMT is 1 hour behind BMT.
GMT and BMT examples
These examples always use GMT (UTC+0) and BMT (UTC+1). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
GMT is 1 hour behind BMT.
How the time difference changes
GMT is 1 hour behind BMT year-round.
Working hours of 9:00 am to 6:00 pm in GMT correspond to 10:00 am to 7:00 pm in BMT.Working hours of 09:00 to 18:00 in GMT correspond to 10:00 to 19:00 in BMT.
Compare GMT time with BMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Greenwich Mean Time is 1 hour behind Biel Mean Time.
12:00 pm12:00 in GMT is 1:00 pm13:00 in BMT
GMT to BMT call time
Best time for a conference call or a meeting is between 9am-5pm09:00-17:00 in GMT which corresponds to 10am-6pm10:00-18:00 in BMT
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
1:00 pm13:00 Biel Mean Time (BMT). Offset UTC +1:00 hour
12:00 pm12:00 GMT / 1:00 pm13:00 BMT
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.
| GMT | BMT |
|---|---|
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| 6:00pm | |
| 7:00pm | |
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| 12:00am next day | |
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| 23:00 | |
| 00:00 next day |
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
Biel Mean Time
Offset: BMT is 1 hour ahead of Greenwich Mean Time (GMT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Central European Summer Time (CEST).
End: Biel Mean Time (BMT) ended on Sunday, March 29, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the last Sunday of March.
Start: Biel Mean Time (BMT) starts on Sunday, October 25, 2026 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 2:00 am02:00. Standard time starts annually on the last Sunday of October.
BMT representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates an offset of one hour to the east of the zero meridian.
- Alpha - Military abbreviation for BMT
- A - short form of 'Alpha'
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time