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Convert Atlantic Time to Tonga Time

AST · UTC−4 → TOT · UTC+13

AST is 17 hours behind TOT

Today Halifax is on ADT (UTC−3) and Nuku‘alofa on UTC+13 (UTC+13), so right now Halifax is 16 hours behind Nuku‘alofa.

Halifax · ADT

Wednesday, 7 October 2026

Nuku‘alofa · UTC+13

Thursday, 8 October 2026

When are both sides at work?

0003060912151821
HalifaxADT · -03:00
0003060912151821
Nuku‘alofaUTC+13 · +13:00
1619220104071013

Shared working hours: 17:00–18:00 in Halifax is 09:00–10:00 in Nuku‘alofa.

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

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08:25 Wed 7 Oct Halifax = 00:25 Thu 8 Oct Nuku‘alofa

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Hour-by-hour conversion

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

About this conversion

AST here means Atlantic Time, represented by Halifax (America/Halifax), currently UTC−3. TOT means Tonga Time, represented by Nuku‘alofa (Pacific/Tongatapu), currently UTC+13.

AST is used by 32 zones, including Canada. If you meant a different one, see every meaning of AST.

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 Halifax; day boundaries are marked where the date differs.

Quick answers

  • 09:00 AST is 01:00 TOT
  • 12:00 AST is 04:00 TOT
  • 15:00 AST is 07:00 TOT
  • 18:00 AST is 10:00 TOT

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