BST to BTT Converter
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Quick answers
Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 18, 2026 = 6:00 pm18:00 BTT (UTC+6), Oct 18, 2026
BST is 5 hours behind BTT.
BST and BTT examples
These examples always use BST (UTC+1) and BTT (UTC+6). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 5 hours behind BTT.
How the time difference changes
For most of the year, BST is 5 hours behind BTT. From Oct 25, 2026 to Mar 28, 2027, GMT is 6 hours behind BTT.
For most of the year, working hours of 9:00 am to 6:00 pm in BST correspond to 2:00 pm to 11:00 pm in BTT. At other times of the year, working hours of 9:00 am to 6:00 pm in GMT correspond to 3:00 pm to 12:00 am (next day) in BTT.For most of the year, working hours of 09:00 to 18:00 in BST correspond to 14:00 to 23:00 in BTT. At other times of the year, working hours of 09:00 to 18:00 in GMT correspond to 15:00 to 00:00 (next day) in BTT.
Compare BST time with BTT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
British Summer Time is 5 hours behind Bhutan Time.
1:00 pm13:00 in BST is 6:00 pm18:00 in BTT
BST to BTT call time
Best time for a conference call or a meeting is between 9am-1pm09:00-13:00 in BST which corresponds to 2pm-6pm14:00-18:00 in BTT
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
6:00 pm18:00 Bhutan Time (BTT). Offset UTC +6:00 hours
1:00 pm13:00 BST / 6:00 pm18:00 BTT
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.
| BST | BTT |
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British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Guernsey, Isle of Man, Jersey, United Kingdom
Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.
Current time in the United Kingdom: UK time now
Today all shaded areas are on BST.
Daylight Saving: British Summer Time (BST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Greenwich Mean Time (GMT).
Start: British Summer Time (BST) started on Sunday, March 29, 2026 at 1:00 am01:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 2:00 am02:00. Daylight saving starts annually on the last Sunday of March.
End: British Summer Time (BST) ends on Sunday, October 25, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.
See United Kingdom daylight saving time and upcoming clock changes worldwide.
BST 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 BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- 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
Bhutan Time
Offset: BTT is 6 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Bhutan
Principal Cities: The largest city in the BTT time zone is Thimphu in Bhutan, with about 98,676 people. Other major cities in this time zone include Phuntsholing, Tsirang, Punākha, Pemagatshel.
Daylight Saving: Clocks in Bhutan Time (BTT) do not change for daylight saving time, so BTT stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
BTT representations, usage and related time zones
- +06 - basic short
- +0600 - basic
- +06:00 - extended
- +0600 - sign character (+) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the east of the zero meridian.
- Foxtrot - Military abbreviation for BTT
- F - short form of 'Foxtrot'
- BST - Bangladesh Standard Time
- BDT - Bangladesh Time
- BTT - Bhutan Time
- F - Foxtrot Time Zone
- IOT - Indian Chagos Time
- KGT - Kyrgyzstan Time
- OMST - Omsk Standard Time
- XJT - Xinjiang Time
- YEKST - Yekaterinburg Summer Time