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Convert Hawaii-Aleutian Time to Korean Time

HAST · UTC−9 → KST · UTC+9

HAST is 18 hours behind KST

Adak · HADT

Monday, 7 September 2026

Seoul · UTC+9

Tuesday, 8 September 2026

When are both sides at work?

0003060912151821
AdakHADT · -09:00
0003060912151821
SeoulUTC+9 · +09:00
1821000306091215

Shared working hours: 15:00–18:00 in Adak is 09:00–12:00 in Seoul.

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

Pick a time and share it

22:06 Mon 7 Sep Adak = 16:06 Tue 8 Sep Seoul

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Hour-by-hour conversion

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

About this conversion

HAST here means Hawaii-Aleutian Time, represented by Adak (America/Adak), currently UTC−9. KST means Korean Time, represented by Seoul (Asia/Seoul), currently UTC+9.

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

KST is used by 2 zones, including South Korea. See every meaning of KST.

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

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