Seattle to KST time conversion

Time in Seattle

PDTUTC-7Daylight saving time

KST time

KSTUTC+9Not observed

KST is 16 hours ahead of Seattle. After the next clock change (): KST is 17 hours ahead of Seattle.

Time difference with your location

Seattle is 7 hours behind UTC. Compare with your local time →

Choose a date and time

Choose the local time in Seattle to convert it to KST on that date.

KST to Seattle time conversion

Skipped clock-change times are unavailable; a repeated time uses its first occurrence.

24-hour conversion chart · Seattle → KST

This table converts each hour in Seattle to KST on 2026-10-21.

  • Working hours
  • Outside working hours
  • Night hours
SeattleKSTShared working hours
00:0012:00 AM 16:004:00 PM
01:001:00 AM 17:005:00 PM
02:002:00 AM 18:006:00 PM
03:003:00 AM 19:007:00 PM
04:004:00 AM 20:008:00 PM
05:005:00 AM 21:009:00 PM
06:006:00 AM 22:0010:00 PM
07:007:00 AM 23:0011:00 PM
08:008:00 AM 00:0012:00 AM +1 day
09:009:00 AM 01:001:00 AM +1 day
10:0010:00 AM 02:002:00 AM +1 day
11:0011:00 AM 03:003:00 AM +1 day
12:0012:00 PM 04:004:00 AM +1 day
13:001:00 PM 05:005:00 AM +1 day
14:002:00 PM 06:006:00 AM +1 day
15:003:00 PM 07:007:00 AM +1 day
16:004:00 PM 08:008:00 AM +1 day ✓
17:005:00 PM 09:009:00 AM +1 day ✓
18:006:00 PM 10:0010:00 AM +1 day
19:007:00 PM 11:0011:00 AM +1 day
20:008:00 PM 12:0012:00 PM +1 day
21:009:00 PM 13:001:00 PM +1 day
22:0010:00 PM 14:002:00 PM +1 day
23:0011:00 PM 15:003:00 PM +1 day

Quick conversion examples

These examples use Seattle (UTC-7) and KST (UTC+9); choosing a date applies the local clock changes.

Conversion formula: KST = Seattle + 16h · Seattle + 17h.

SeattleKST
6:00 AM Seattle= 10:00 PM KST
7:00 AM Seattle= 11:00 PM KST
8:00 AM Seattle= 12:00 AM KST (+1 day)
9:00 AM Seattle= 1:00 AM KST (+1 day)
10:00 AM Seattle= 2:00 AM KST (+1 day)
12:00 PM Seattle= 4:00 AM KST (+1 day)
3:00 PM Seattle= 7:00 AM KST (+1 day)
5:00 PM Seattle= 9:00 AM KST (+1 day)
6:00 PM Seattle= 10:00 AM KST (+1 day)
8:00 PM Seattle= 12:00 PM KST (+1 day)

Overlapping meeting hours

The 08:00–18:00 working day in Seattle and KST overlaps for 2 hours on 2026-10-21.

Shared working hours
16:00–18:00 Seattle · 08:00–10:00 KST

Clock changes on both sides, 2026–2028

Seattle and KST have the following local clock changes in 2026–2028; all times in the table are local to that side.

YearSeattleKST
2026

· 02:00 → 03:00
UTC-8 → UTC-7

· 02:00 → 01:00
UTC-7 → UTC-8

 No clock changes; UTC+9 all year.
2027

· 02:00 → 03:00
UTC-8 → UTC-7

· 02:00 → 01:00
UTC-7 → UTC-8

 No clock changes; UTC+9 all year.
2028

· 02:00 → 03:00
UTC-8 → UTC-7

· 02:00 → 01:00
UTC-7 → UTC-8

 No clock changes; UTC+9 all year.

At the start of 2026, KST is 17 hours ahead of Seattle. The difference changes during the following periods.

  • From 2026-03-08 03:00 Seattle until 2026-11-01 01:00 Seattle, KST is 16 hours ahead of Seattle.
  • From 2027-03-14 03:00 Seattle until 2027-11-07 01:00 Seattle, KST is 16 hours ahead of Seattle.
  • From 2028-03-12 03:00 Seattle until 2028-11-05 01:00 Seattle, KST is 16 hours ahead of Seattle.

Frequently asked questions

What time is 9 AM Seattle in KST?

9:00 AM Seattle = 1:00 AM KST (+1 day), using UTC-7 and UTC+9. Choose a date above for the seasonal local time.

Does the time difference between Seattle and KST change during the year?

Yes. During 2026–2028: KST is 16 hours ahead of Seattle; KST is 17 hours ahead of Seattle. The clock-change table gives the dates for both sides.

How do I tell whether it is day or night in KST?

Read the KST clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.

What is the best time to call between Seattle and KST?

The shared 08:00–18:00 working window is 16:00–18:00 Seattle / 08:00–10:00 KST, a total of 2 hours.

What is the time difference between Seattle and KST now?

Right now, KST is 16 hours ahead of Seattle. Conversion formula: KST = Seattle + 16h · Seattle + 17h.