International event times
Convert a UTC sports event, release or maintenance window into the Korean calendar date before adding it to a schedule.
UTC ↔ Korea Standard Time
UTC to KST
time converter
Convert Coordinated Universal Time and Korea Standard Time in either direction. The result includes both calendar dates, Unix seconds and an ISO 8601 value so midnight changes are easy to spot.
The nine-hour difference between UTC and KST
KST is UTC+09:00. Check the date as well as the clock time whenever a conversion crosses midnight.
| UTC | Korea time | Date relationship |
|---|---|---|
| 00:00 | 09:00 | Same day |
| 06:00 | 15:00 | Same day |
| 14:59 | 23:59 | Same day |
| 15:00 | 00:00 | Next day in Korea |
| 23:00 | 08:00 | Next day in Korea |
Record comparison
Match an order, access or media timestamp recorded in UTC with the clock time experienced in Korea.
Clear sharing
Give people a KST display while retaining UTC and ISO 8601 for teams in other regions.
Always check the date. 15:00 UTC is midnight at the start of the next day in Korea. Deadlines, flights and broadcasts are especially easy to place on the wrong day.
How to read the result
UTC, KST, Unix seconds and ISO 8601 are different representations of one instant, not separate events.
UTC
The global reference time used to compare records across regions. Its numeric offset is +00:00.
KST
South Korea's standard time, currently fixed at +09:00 throughout the year.
Unix seconds
The count from the Unix epoch. The number stays the same whether the instant is displayed in UTC or KST.
For global time-zone history and future rule updates, consult the IANA Time Zone Database.
UTC and KST questions
Quick answers about the offset, daylight saving time and date changes.
How many hours ahead of UTC is Korea?
Korea Standard Time is UTC+09:00, so it is nine hours ahead of UTC throughout the year.
Does South Korea use daylight saving time?
South Korea does not currently observe daylight saving time, so the UTC+09:00 offset stays constant during the year.
Why does the date change when converting UTC to KST?
Adding nine hours can cross midnight. For example, 15:00 UTC becomes 00:00 KST on the following calendar day.
Does the Unix timestamp change when I display KST?
No. UTC and KST are two displays of the same instant, so its Unix timestamp remains unchanged.
Related timestamp tools
Convert Unix numbers, validate offset strings or view the current instant.
Number to date
Timestamp converter
Show a Unix value in UTC, KST, local time and a named city.
Convert a timestamp →Offset validationISO 8601 validator
Check a date string with Z or a numeric offset.
Validate a string →Live clockCurrent Unix time
See the present UTC, KST, seconds and milliseconds.
View current time →