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Convert Chatham Time to Iran Time

CHAST · UTC+12:45 → IRST · UTC+3:30

CHAST is 9 hours 15 minutes ahead of IRST

Today Chatham is on CHADT (UTC+13:45) and Tehran on UTC+3:30 (UTC+3:30), so right now Chatham is 10 hours 15 minutes ahead of Tehran.

Chatham · CHADT

Thursday, 8 October 2026

Tehran · UTC+3:30

Wednesday, 7 October 2026

When are both sides at work?

0003060912151821
ChathamCHADT · +13:45
0003060912151821
TehranUTC+3:30 · +03:30
1316192201040710

No overlap in standard working hours. Closest workable window: 19:30–23:00 in Chatham, which is 09:15–12:45 in Tehran.

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

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01:11 Thu 8 Oct Chatham = 14:56 Wed 7 Oct Tehran

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Hour-by-hour conversion

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

About this conversion

CHAST here means Chatham Time, represented by Chatham (Pacific/Chatham), currently UTC+13:45. IRST means Iran Time, represented by Tehran (Asia/Tehran), currently UTC+3:30.

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 Chatham; day boundaries are marked where the date differs.

Quick answers

  • 09:00 CHAST is 22:45 IRST
  • 12:00 CHAST is 01:45 IRST
  • 15:00 CHAST is 04:45 IRST
  • 18:00 CHAST is 07:45 IRST

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