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Convert Hawaii-Aleutian Time to Coordinated Universal Time (UTC)

HAST · UTC−9 → UTC · UTC+0

HAST is 9 hours behind UTC

Adak · HADT

Monday, 7 September 2026

· UTC

Tuesday, 8 September 2026

When are both sides at work?

0003060912151821
AdakHADT · -09:00
0003060912151821
UTC · +00:00
0912151821000306

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

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

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22:06 Mon 7 Sep Adak = 07:06 Tue 8 Sep

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Hour-by-hour conversion

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

About this conversion

HAST here means Hawaii-Aleutian Time, represented by Adak (America/Adak), currently UTC−9. UTC means Coordinated Universal Time (UTC), represented by (UTC), currently UTC+0.

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 18:00 UTC
  • 12:00 HAST is 21:00 UTC
  • 15:00 HAST is 00:00 UTC
  • 18:00 HAST is 03:00 UTC

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