The short answer
10pm in Tonga is 10am in Greenwich Mean Time.
Tonga is 12 hours ahead of Greenwich Mean Time. It falls outside the 9-to-5 in Tonga but lands inside working hours in Greenwich Mean Time.
Tonga☾
10pm
Greenwich Mean Time☀
10am
Right now
9:38am+13:00 · UTC+13:00 · Thu, Jun 25
9:38pmBST · UTC+01:00 · Wed, Jun 24
Read across to convert
Tonga
+13:00 · UTC+13:00
Greenwich Mean Time
BST · UTC+01:00
Pinned10pmTonga=10amGreenwich Mean Time
12amThu
12pmWed ·−1d
WORK1am
1pmWed ·−1d
WORK2am
2pmWed ·−1d
WORK3am
3pmWed ·−1d
WORK4am
4pmWed ·−1d
WORK5am
5pmWed ·−1d
6am
6pmWed ·−1d
7am
7pmWed ·−1d
8am
8pmWed ·−1d
NOW
9am
WORK9pmWed ·−1d
10am
WORK10pmWed ·−1d
11am
WORK11pmWed ·−1d
12pm
WORK12amThu
1pm
WORK1am
2pm
WORK2am
3pm
WORK3am
4pm
WORK4am
5pm
5am
6pm
6am
7pm
7am
8pm
8am
9pm
9am
WORKPINNED
10pm
10am
WORK11pm
11am
WORKdaylightnightworking hoursoverlap
Best time to meet
No shared working hours.
Tonga and Greenwich Mean 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=9pmGreenwich Mean Time · prev day
12pmTonga=12amGreenwich Mean Time
3pmTonga=3amGreenwich Mean Time
5pmTonga=5amGreenwich Mean Time
9pmTonga=9amGreenwich Mean Time
In context
What each side covers.
Tonga
9:38am+13:00 · UTC+13:00
Cities on this clock
Greenwich Mean Time
9:38pmBST · UTC+01:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
1:38pm
India Standard Time
2:08am
Pacific Time to India12 hours 30 minutes behind
Eastern Standard Time
4:38pm
Central European Time
10:38pm
Eastern Time to Central Europe6 hours behind
India Standard Time
2:08am
Eastern Standard Time
4:38pm
India to Eastern Time9 hours 30 minutes ahead
Greenwich Mean Time
9:38pm
India Standard Time
2:08am
London to India4 hours 30 minutes behind
Pacific Standard Time
1:38pm
Eastern Standard Time
4:38pm
Pacific to Eastern Time3 hours behind
Central European Time
10:38pm
India Standard Time
2:08am
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Tonga and Greenwich Mean Time. Can't find what you need? Email [email protected].
- What is the time difference between Tonga and Greenwich Mean Time?
- Tonga is 12 hours ahead of Greenwich Mean 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 10pm in Tonga, what time is it in Greenwich Mean Time?
- 10pm in Tonga is 10am in Greenwich Mean Time. It falls outside the 9-to-5 in Tonga but lands inside working hours in Greenwich Mean Time. Use the hour-by-hour table above to read any other time across.
- What's the best time for a call between Tonga and Greenwich Mean Time?
- There's no comfortable 9-to-5 overlap between Tonga and Greenwich Mean 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.