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Convert Hawaii-Aleutian Time to Syowa Time

HAST · UTC−9 → SYOT · UTC+3

HAST is 12 hours behind SYOT

Adak · HADT

Monday, 7 September 2026

Syowa · UTC+3

Tuesday, 8 September 2026

When are both sides at work?

0003060912151821
AdakHADT · -09:00
0003060912151821
SyowaUTC+3 · +03:00
1215182100030609

No overlap in standard working hours. Closest workable window: 09:00–11:00 in Adak, which is 21:00–23:00 in Syowa.

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

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22:06 Mon 7 Sep Adak = 10:06 Tue 8 Sep Syowa

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Hour-by-hour conversion

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

About this conversion

HAST here means Hawaii-Aleutian Time, represented by Adak (America/Adak), currently UTC−9. SYOT means Syowa Time, represented by Syowa (Antarctica/Syowa), currently UTC+3.

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 21:00 SYOT
  • 12:00 HAST is 00:00 SYOT
  • 15:00 HAST is 03:00 SYOT
  • 18:00 HAST is 06:00 SYOT

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