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Convert Atlantic Time to Iran Time

AST · UTC−4 → IRST · UTC+3:30

AST is 7 hours 30 minutes behind IRST

Today Halifax is on ADT (UTC−3) and Tehran on UTC+3:30 (UTC+3:30), so right now Halifax is 6 hours 30 minutes behind Tehran.

Halifax · ADT

Wednesday, 7 October 2026

Tehran · UTC+3:30

Wednesday, 7 October 2026

When are both sides at work?

0003060912151821
HalifaxADT · -03:00
0003060912151821
TehranUTC+3:30 · +03:30
0609121518210003

Shared working hours: 09:00–11:30 in Halifax is 15:30–18:00 in Tehran.

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

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08:24 Wed 7 Oct Halifax = 14:54 Wed 7 Oct Tehran

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Hour-by-hour conversion

Halifax (AST)Tehran (IRST)
00:0006:30
01:0007:30
02:0008:30
03:0009:30
04:0010:30
05:0011:30
06:0012:30
07:0013:30
08:0014:30Now
09:0015:30Both at work
10:0016:30Both at work
11:0017:30Both at work
12:0018:30
13:0019:30
14:0020:30
15:0021:30
16:0022:30
17:0023:30
18:0000:30next day
19:0001:30next day
20:0002:30next day
21:0003:30next day
22:0004:30next day
23:0005:30next day

About this conversion

AST here means Atlantic Time, represented by Halifax (America/Halifax), currently UTC−3. IRST means Iran Time, represented by Tehran (Asia/Tehran), currently UTC+3:30.

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 15:30 IRST
  • 12:00 AST is 18:30 IRST
  • 15:00 AST is 21:30 IRST
  • 18:00 AST is 00:30 IRST

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