Asia/Seoul is an IANA time zone used in South Korea. It stays on UTC+9 all year.
Asia/Seoul at a glance
| UTC offset now | UTC+9 |
|---|---|
| Standard time | UTC+9 (KST) |
| Abbreviations | KST |
| Used in | South Korea |
How Asia/Seoul keeps time
No clock changes are scheduled in Asia/Seoul. The last one for daylight saving time was in 1988; since then the offset has been UTC+9 all year.
Recent and upcoming changes in Asia/Seoul
| Date | Change | New offset |
|---|---|---|
| Sunday, May 10, 1987 | Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM | UTC+10 |
| Sunday, October 11, 1987 | Clocks go back 1 hour: 3:00 AM becomes 2:00 AM | UTC+9 |
| Sunday, May 8, 1988 | Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM | UTC+10 |
| Sunday, October 9, 1988 | Clocks go back 1 hour for good: 3:00 AM becomes 2:00 AM | UTC+9 |
Countries and cities on Asia/Seoul
Asia/Seoul is used in South Korea. These are the largest cities in our list that follow it.
Asia/Seoul compared with other time zones
Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.
| City | Time now | Difference now | In January | In July |
|---|---|---|---|---|
| New York (United States) | --:-- | 14 h behind | 14 h behind | 13 h behind |
| Los Angeles (United States) | --:-- | 17 h behind | 17 h behind | 16 h behind |
| London (United Kingdom) | --:-- | 9 h behind | 9 h behind | 8 h behind |
| Paris (France) | --:-- | 8 h behind | 8 h behind | 7 h behind |
| Dubai (United Arab Emirates) | --:-- | 5 h behind | 5 h behind | 5 h behind |
| Mumbai (India) | --:-- | 3 h 30 min behind | 3 h 30 min behind | 3 h 30 min behind |
| Singapore | --:-- | 1 h behind | 1 h behind | 1 h behind |
| Tokyo (Japan) | --:-- | Same time | Same time | Same time |
| Sydney (Australia) | --:-- | 2 h ahead | 2 h ahead | 1 h ahead |
| UTC | --:-- | 9 h behind | 9 h behind | 9 h behind |
Other zones on UTC+9 right now
These IANA zones show the same time as Asia/Seoul today. Their clock-change rules may differ.
Using Asia/Seoul in software
Use the zone name Asia/Seoul rather than an abbreviation or a fixed offset. Abbreviations can mean several zones, and offsets ignore future clock changes.
Show the current time in Asia/Seoul:
// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'Asia/Seoul', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('Asia/Seoul'))
// PHP
(new DateTime('now', new DateTimeZone('Asia/Seoul')))->format('c');
# Shell
TZ=Asia/Seoul datePlan around the time in Asia/Seoul
- Convert a time to or from Asia/Seoul: pick a date and time and see it in every city on your list.
- Add Seoul to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in Asia/Seoul and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is the UTC offset of Asia/Seoul?
UTC+9, all year.
What abbreviation does Asia/Seoul use?
KST. Abbreviations are not unique, so use the zone name Asia/Seoul in software.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.