Time calculator

Seoul Time

Live local time in Seoul and South Korea (Asia/Seoul). Free online tool — no sign-up. Clear formulas and worked examples. Runs locally in your browser.

Instant result

Result

—

Enter values to calculate.

Inputs—

Mode—

Formula—

Trust summary Engine tested · Specification checked · v1.0.1

Input interpretation: Enter values to calculate.
Result: —
Model: Current local date and time in the Asia/Seoul time zone (Korea Standard Time).
Scope: Device clock and OS timezone database are reasonably correct.
Verification: Engine tested · Specification checked · v1.0.1
Named expert review: Optional · Not performed
Specification basis: IANA time zone database — Asia/Seoul
Korea Standard Time (KST) = UTC+09:00
South Korea: no Daylight Saving Time
Specification basis

Formulas

Core equations used by this calculator.

IANA zoneAsia/Seoul

KST (year-round)UTC + 9 hours

iNo seasonal clock change. Same UTC+9 offset as Asia/Tokyo; separate IANA zone.

How to use

Open the live clock

The page shows current date and time for Asia/Seoul from your browser.

Refresh if needed

Use Refresh to re-read the clock; the display also updates about once per second.

Plan with a fixed offset

South Korea stays on KST (UTC+9) all year.

Example calculations

Common configurations with formula and result.

Noon UTC

KST = UTC+9

12:00 UTC + 9 h

21:00 KST

vs Tokyo

Both UTC+9

Difference = 0

Identical clock time

vs Beijing

CST = UTC+8

1 hour difference

Seoul is 1 hour ahead of Beijing

vs Bangkok

ICT = UTC+7

2 hour difference

Seoul is 2 hours ahead of Bangkok

Seoul vs other zones

Common values at a glance.

City / zone	Offset	Seoul relative
Tokyo (JST)	UTC+9	Same time
Beijing / Hong Kong / Singapore	UTC+8	1 hour ahead
Bangkok (ICT)	UTC+7	2 hours ahead
India (IST)	UTC+5:30	3 hours 30 min ahead
London (GMT)	UTC+0	9 hours ahead
UTC	UTC+0	9 hours ahead

i When London is on BST, Seoul’s lead is 8 hours. Seoul’s own offset never changes.

Seoul Time specification

Version 1.0.1 · Engine tested

Calculation status

Engine tested 3 published cases
Named expert review Not performed
Calculation version 1.0.1

Review policy

Definition: Seoul and South Korea use Korea Standard Time (KST, UTC+09:00) on the IANA zone Asia/Seoul year-round. South Korea does not currently observe Daylight Saving Time. The clock matches Tokyo (JST).
What it calculates: Current local date and time in the Asia/Seoul time zone (Korea Standard Time).
Inputs: None — uses the device clock and the IANA zone Asia/Seoul
Outputs: Local time (24-hour style from the browser formatter)
Local calendar date
Formula: Display = Intl.DateTimeFormat with timeZone Asia/Seoul
Assumptions: Device clock and OS timezone database are reasonably correct.
Runs locally in the browser; no server round-trip for the clock.
Units: Civil local time (hours, minutes, seconds)
UTC offset KST +9 (fixed)
Boundary conditions: No DST transitions
Example: 12:00 UTC → 21:00 Asia/Seoul
Validation cases: 3 published on this page
UTC 12:00 → 21:00 Asia/Seoul
Same instant as Asia/Tokyo → Identical clock time
Same instant as Asia/Shanghai → Seoul is 1 hour later
Specification basis: IANA time zone database — Asia/Seoul
Korea Standard Time (KST) = UTC+09:00
South Korea: no Daylight Saving Time
Calculation version: 1.0.1

Background

Interpretation and common distinctions.

Current time in Seoul, South Korea

This page shows a live local clock for Seoul and South Korea, using the IANA zone Asia/Seoul. Time is read from your browser with that zone applied — UTC+9 all year.

Korea Standard Time (KST)

Name	Abbreviation	UTC offset	DST
Korea Standard Time	KST	UTC+9	None

South Korea does not currently observe Daylight Saving Time. The clock matches Tokyo (Japan Standard Time).

How Seoul time compares

Tokyo: identical local time.
Beijing / Hong Kong / Singapore: Seoul is 1 hour ahead.
Bangkok: Seoul is 2 hours ahead.
India: Seoul is 3 hours 30 minutes ahead.
London: 9 hours ahead of GMT; 8 hours ahead of BST.
UTC: always 9 hours ahead.

Other calculators in this family: Tokyo / Japan Time, Beijing / China Time, Hong Kong Time, UTC Time .

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Frequently asked questions

Key distinctions behind the calculation.

What time zone is Seoul in?

Seoul uses Korea Standard Time (KST). The IANA identifier is Asia/Seoul. The offset is UTC+9 all year.

Does South Korea observe Daylight Saving Time?

No. South Korea does not currently observe DST. Clocks stay on KST (UTC+9) year-round.

Is Seoul the same time as Tokyo?

Yes — both are UTC+9. They use different IANA zones (Asia/Seoul vs Asia/Tokyo).

How does Seoul compare to Beijing?

Seoul is always one hour ahead of China Standard Time (UTC+8).

What is UTC?

Coordinated Universal Time is the global time standard. South Korea is always UTC+9.