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Convert Hawaii-Aleutian Time to Indian Ocean Time

HAST · UTC−9 → IOT · UTC+6

HAST is 15 hours behind IOT

Adak · HADT

Monday, 7 September 2026

Chagos · UTC+6

Tuesday, 8 September 2026

When are both sides at work?

0003060912151821
AdakHADT · -09:00
0003060912151821
ChagosUTC+6 · +06:00
1518210003060912

No overlap in standard working hours. Closest workable window: 16:00–23:00 in Adak, which is 07:00–14:00 in Chagos.

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

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22:06 Mon 7 Sep Adak = 13:06 Tue 8 Sep Chagos

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Hour-by-hour conversion

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

About this conversion

HAST here means Hawaii-Aleutian Time, represented by Adak (America/Adak), currently UTC−9. IOT means Indian Ocean Time, represented by Chagos (Indian/Chagos), currently UTC+6.

HAST is used by 2 zones, including United States. If you meant a different one, see every meaning of HAST.

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 Adak; day boundaries are marked where the date differs.

Quick answers

  • 09:00 HAST is 00:00 IOT
  • 12:00 HAST is 03:00 IOT
  • 15:00 HAST is 06:00 IOT
  • 18:00 HAST is 09:00 IOT

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