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Convert Atlantic Time to Chatham Time

AST · UTC−4 → CHAST · UTC+12:45

AST is 16 hours 45 minutes behind CHAST

Halifax · ADT

Wednesday, 7 October 2026

Chatham · CHADT

Thursday, 8 October 2026

When are both sides at work?

0003060912151821
HalifaxADT · -03:00
0003060912151821
ChathamCHADT · +13:45
1619220104071013

Shared working hours: 16:30–18:00 in Halifax is 09:15–10:45 in Chatham.

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

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08:24 Wed 7 Oct Halifax = 01:09 Thu 8 Oct Chatham

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Hour-by-hour conversion

Halifax (AST)Chatham (CHAST)
00:0016:45
01:0017:45
02:0018:45
03:0019:45
04:0020:45
05:0021:45
06:0022:45
07:0023:45
08:0000:45next dayNow
09:0001:45next day
10:0002:45next day
11:0003:45next day
12:0004:45next day
13:0005:45next day
14:0006:45next day
15:0007:45next day
16:0008:45next day
17:0009:45next dayBoth at work
18:0010:45next day
19:0011:45next day
20:0012:45next day
21:0013:45next day
22:0014:45next day
23:0015:45next day

About this conversion

AST here means Atlantic Time, represented by Halifax (America/Halifax), currently UTC−3. CHAST means Chatham Time, represented by Chatham (Pacific/Chatham), currently UTC+13:45.

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 01:45 CHAST
  • 12:00 AST is 04:45 CHAST
  • 15:00 AST is 07:45 CHAST
  • 18:00 AST is 10:45 CHAST

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