The short answer
Tonga is 12 hours ahead of British Summer Time.
Tonga☾
3:08:15am
+13:00 · UTC+13:00 · Fri, Oct 16
British Summer Time☀
3:08:15pm
BST · UTC+01:00 · Thu, Oct 15
Read across to convert
Tonga
+13:00 · UTC+13:00
British Summer Time
BST · UTC+01:00
Click any row to pin that hour across both zones.
12amFri
12pmThu ·−1d
WORK1am
1pmThu ·−1d
WORK2am
2pmThu ·−1d
WORKNOW
3am
3pmThu ·−1d
WORK4am
4pmThu ·−1d
WORK5am
5pmThu ·−1d
6am
6pmThu ·−1d
7am
7pmThu ·−1d
8am
8pmThu ·−1d
9am
WORK9pmThu ·−1d
10am
WORK10pmThu ·−1d
11am
WORK11pmThu ·−1d
12pm
WORK12amFri
1pm
WORK1am
2pm
WORK2am
3pm
WORK3am
4pm
WORK4am
5pm
5am
6pm
6am
7pm
7am
8pm
8am
9pm
9am
WORK10pm
10am
WORK11pm
11am
WORKdaylightnightworking hoursoverlap
Best time to meet
No shared working hours.
Tonga and British Summer Time are too far apart for a working-day overlap. The least-unsociable option is an early-morning call on one side and an evening one on the other — or hand work off asynchronously and let the planet do the waiting.
Popular conversions
Quick reference.
9amTonga=9pmBritish Summer Time · prev day
12pmTonga=12amBritish Summer Time
3pmTonga=3amBritish Summer Time
5pmTonga=5amBritish Summer Time
9pmTonga=9amBritish Summer Time
In context
What each side covers.
Tonga
3:08am+13:00 · UTC+13:00
Cities on this clock
British Summer Time
3:08pmBST · UTC+01:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
7:08am
India Standard Time
7:38pm
Pacific Time to India12 hours 30 minutes behind
Eastern Daylight Time
10:08am
Central European Time
4:08pm
Eastern Time to Central Europe6 hours behind
India Standard Time
7:38pm
Eastern Daylight Time
10:08am
India to Eastern Time9 hours 30 minutes ahead
British Summer Time
3:08pm
India Standard Time
7:38pm
London to India4 hours 30 minutes behind
Pacific Daylight Time
7:08am
Eastern Daylight Time
10:08am
Pacific to Eastern Time3 hours behind
Central European Time
4:08pm
India Standard Time
7:38pm
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Tonga and British Summer Time. Can't find what you need? Email [email protected].
- What is the time difference between Tonga and British Summer Time?
- Tonga is 12 hours ahead of British Summer Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.
- When it's 9am in Tonga, what time is it in British Summer Time?
- 9am in Tonga is 9pm in British Summer Time on the previous day. Use the hour-by-hour table above to read any other time across — find the row and read the matching cell in the other column.
- What's the best time for a call between Tonga and British Summer Time?
- There's no comfortable 9-to-5 overlap between Tonga and British Summer Time — they sit on opposite sides of the planet's working day. Plan for an early or late call on one side, or hand work off asynchronously.
- Does this account for daylight saving time?
- Yes. We track every clock change in both places, so the abbreviations you see — +13:00 and BST — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.
- Why is the date sometimes different on each side?
- When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.