BST to TOT Converter
No shared working hoursThu, Oct 15
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Quick answers
Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 15, 2026 = 1:00 am01:00 TOT (UTC+13), Oct 16, 2026
BST is 12 hours behind TOT.
BST and TOT examples
These examples always use BST (UTC+1) and TOT (UTC+13). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 12 hours behind TOT.
How the time difference changes
For most of the year, BST is 12 hours behind TOT. From Oct 25, 2026 to Mar 28, 2027, GMT is 13 hours behind TOT.
For most of the year, working hours of 9:00 am to 6:00 pm in BST correspond to 9:00 pm to 6:00 am (next day) in TOT. At other times of the year, working hours of 9:00 am to 6:00 pm in GMT correspond to 10:00 pm to 7:00 am (next day) in TOT.For most of the year, working hours of 09:00 to 18:00 in BST correspond to 21:00 to 06:00 (next day) in TOT. At other times of the year, working hours of 09:00 to 18:00 in GMT correspond to 22:00 to 07:00 (next day) in TOT.
Compare BST time with TOT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
British Summer Time is 12 hours behind Tonga Time.
1:00 pm13:00 in BST is 1:00 am01:00 in TOT
BST to TOT call time
Best time for a conference call or a meeting is between 7am-8am07:00-08:00 in BST which corresponds to 7pm-8pm19:00-20:00 in TOT. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
1:00 am01:00 Tonga Time (TOT). Offset UTC +13:00 hours
1:00 pm13:00 BST / 1:00 am01:00 TOT
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.
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British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Britain (UK), Guernsey, Isle of Man, Jersey
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.
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.
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
Tonga Time
Offset: TOT is 13 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Tonga
Principal Cities: The largest city in the TOT time zone is Nuku‘alofa in Tonga, with about 22,400 people. Other major cities in this time zone include Mu‘a, Neiafu, Haveluloto, Tofoa-Koloua.
Daylight Saving: Clocks in Tonga Time (TOT) do not change for daylight saving time, so TOT stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
TOT representations, usage and related time zones
- +13 - basic short
- +1300 - basic
- +13:00 - extended
- +1300 - sign character (+) followed by a four digit time providing hours (13) and minutes (00) of the offset. Indicates an offset of thirteen hours to the east of the zero meridian.
- FJST - Fiji Summer Time
- NZDT - New Zealand Daylight Time
- PHOT - Phoenix Island Time
- TKT - Tokelau Time
- TOT - Tonga Time
- WST - West Samoa Time
- WSST - West Samoa Standard Time