TOT to BST Converter
No shared working hoursFri, Oct 16
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Quick answers
Selected conversion
1:00 am01:00 TOT (UTC+13), Oct 16, 2026 = 1:00 pm13:00 BST (UTC+1), Oct 15, 2026
TOT is 12 hours ahead of BST.
TOT and BST examples
These examples always use TOT (UTC+13) and BST (UTC+1). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
TOT is 12 hours ahead of BST.
How the time difference changes
For most of the year, TOT is 12 hours ahead of BST. From Oct 25, 2026 to Mar 28, 2027, TOT is 13 hours ahead of GMT.
For most of the year, working hours of 9:00 am to 6:00 pm in TOT correspond to 9:00 pm (previous day) to 6:00 am in BST. At other times of the year, working hours of 9:00 am to 6:00 pm in TOT correspond to 8:00 pm (previous day) to 5:00 am in GMT.For most of the year, working hours of 09:00 to 18:00 in TOT correspond to 21:00 (previous day) to 06:00 in BST. At other times of the year, working hours of 09:00 to 18:00 in TOT correspond to 20:00 (previous day) to 05:00 in GMT.
Compare TOT time with BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Tonga Time is 12 hours ahead of British Summer Time.
1:00 am01:00 in TOT is 1:00 pm13:00 in BST
TOT to BST call time
Best time for a conference call or a meeting is between 7am-8am07:00-08:00 in TOT which corresponds to 7pm-8pm19:00-20:00 in BST (previous day). Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
1:00 am01:00 Tonga Time (TOT). Offset UTC +13:00 hours
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
1:00 am01:00 TOT / 1:00 pm13:00 BST
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.
| TOT | BST |
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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
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