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Convert Greenwich Mean Time to Tonga Time

GMT · UTC+1 → TOT · UTC+13

GMT is 12 hours behind TOT

London · BST

Tuesday, 8 September 2026

Nuku‘alofa · UTC+13

Tuesday, 8 September 2026

When are both sides at work?

0003060912151821
LondonBST · +01:00
0003060912151821
Nuku‘alofaUTC+13 · +13:00
1215182100030609

No overlap in standard working hours. Closest workable window: 09:00–11:00 in London, which is 21:00–23:00 in Nuku‘alofa.

Working (09–18) Awake, off the clock Asleep (23–07)

Pick a time and share it

08:05 Tue 8 Sep London = 20:05 Tue 8 Sep Nuku‘alofa

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Hour-by-hour conversion

London (GMT)Nuku‘alofa (TOT)
00:0012:00
01:0013:00
02:0014:00
03:0015:00
04:0016:00
05:0017:00
06:0018:00
07:0019:00
08:0020:00Now
09:0021:00
10:0022:00
11:0023:00
12:0000:00next day
13:0001:00next day
14:0002:00next day
15:0003:00next day
16:0004:00next day
17:0005:00next day
18:0006:00next day
19:0007:00next day
20:0008:00next day
21:0009:00next day
22:0010:00next day
23:0011:00next day

About this conversion

GMT here means Greenwich Mean Time, represented by London (Europe/London), currently UTC+1. TOT means Tonga Time, represented by Nuku‘alofa (Pacific/Tongatapu), currently UTC+13.

GMT is used by 22 zones, including United Kingdom. If you meant a different one, see every meaning of GMT.

Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in London; day boundaries are marked where the date differs.

Quick answers

  • 09:00 GMT is 21:00 TOT
  • 12:00 GMT is 00:00 TOT
  • 15:00 GMT is 03:00 TOT
  • 18:00 GMT is 06:00 TOT

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