JST to KST Time Converter

Convert Japan Standard Time to Korean Standard Time - Quick & Accurate

Tokyo (JST)
Seoul (KST)
Same time zone - No time difference

Quick Time Conversion

Tokyo
Japan Standard Time
UTC+9
Seoul
Korean Standard Time
UTC+9

Current Time Right Now

Japan Standard Time (JST)
Korean Standard Time (KST)

Updates live every second

24-Hour Visual Comparison

JST (Tokyo)
12am JST
1am JST
2am JST
3am JST
4am JST
5am JST
6am JST
7am JST
8am JST
9am JST
10am JST
11am JST
12pm JST
1pm JST
2pm JST
3pm JST
4pm JST
5pm JST
6pm JST
7pm JST
8pm JST
9pm JST
10pm JST
11pm JST
12a6a12p6p12a
KST (Seoul)
12am KST
1am KST
2am KST
3am KST
4am KST
5am KST
6am KST
7am KST
8am KST
9am KST
10am KST
11am KST
12pm KST
1pm KST
2pm KST
3pm KST
4pm KST
5pm KST
6pm KST
7pm KST
8pm KST
9pm KST
10pm KST
11pm KST
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Business Hours (9AM-5PM)
Evening (5PM-9PM)
Night (9PM-6AM)

Both time zones are identical - times are synchronized

Best Time for Meeting/Call

To schedule a meeting between JST and KST:

Best Window (JST)
9:00 AM - 5:00 PM
Which is (KST)
9:00 AM - 5:00 PM
Same time in both countries
Complete business hours overlap
Perfect for Japan-Korea collaboration

Pro Tip: Since both countries share the same time zone, scheduling meetings is effortless - just pick any time during business hours!

Complete JST to KST Conversion Table

JST TimeKST TimeContext
12:00 AM12:00 AM
Midnight
01:00 AM01:00 AM
Late Night
02:00 AM02:00 AM
Late Night
03:00 AM03:00 AM
Late Night
04:00 AM04:00 AM
Late Night
05:00 AM05:00 AM
Late Night
06:00 AM06:00 AM
Early Morning
07:00 AM07:00 AM
Night Time
08:00 AM08:00 AM
Night Time
09:00 AM09:00 AM
Work Starts
10:00 AM10:00 AM
Meeting Window
11:00 AM11:00 AM
Meeting Window

Japan Standard Time (JST)

UTC+9
No DST observed
Major Cities:
  • • Tokyo
  • • Osaka
  • • Yokohama
  • • Nagoya
Daylight Saving:

Not observed

IANA Identifier:

Asia/Tokyo

Korean Standard Time (KST)

UTC+9
No DST observed
Major Cities:
  • • Seoul
  • • Busan
  • • Incheon
Daylight Saving:

Not observed

IANA Identifier:

Asia/Seoul

Japan Standard Time (JST) vs Korean Standard Time (KST)

Japan Standard Time (JST)Korean Standard Time (KST)

Japan Standard Time (JST) is 9 hours ahead of Coordinated Universal Time (UTC+9). Japan does not observe Daylight Saving Time, maintaining the same offset year-round.

Korean Standard Time (KST) is 9 hours ahead of Coordinated Universal Time (UTC+9). South Korea does not observe Daylight Saving Time, keeping a consistent offset throughout the year.

Where Is It Used?

  • Japan: Entire country uses JST
  • Major Cities: Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Fukuoka, Kobe
  • Coverage: Single time zone for entire nation
  • South Korea: Entire country uses KST
  • Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju
  • Coverage: Single time zone for entire nation

Key Facts

  • UTC Offset: UTC+9
  • Region: East Asia
  • Known For: Technology, manufacturing, innovation
  • Population: Over 125 million people
  • Daylight Saving: Not observed
  • Economy: Third largest economy in the world
  • UTC Offset: UTC+9
  • Region: East Asia
  • Known For: Technology, K-pop, electronics
  • Population: Over 51 million people
  • Daylight Saving: Not observed
  • Economy: Major global technology hub

Quick Reference

Time Difference: JST and KST are the same - no time difference
Consistency: Both maintain UTC+9 year-round with no DST
Distance: Approximately 750 miles between Tokyo and Seoul
UTC Offsets: Both JST and KST = UTC+9

Frequently Asked Questions

Yes, JST (Japan Standard Time) and KST (Korean Standard Time) are in the same time zone. Both are UTC+9 with no time difference between Tokyo and Seoul.

Since JST and KST are the same, you can call anytime between 9:00 AM and 5:00 PM in either country, and it will be the same time in both locations. Standard business hours work perfectly for both sides.

No, neither Japan nor South Korea observes Daylight Saving Time. Both countries maintain UTC+9 year-round, ensuring the time is always synchronized.

JST cities include Tokyo, Osaka, Yokohama, and Nagoya. KST cities include Seoul, Busan, and Incheon. All these cities share the same time.

Both countries are located at similar longitudes in East Asia and use UTC+9 as their standard time. This geographical proximity means they naturally fall within the same time zone.

Related Time Converters

KST → JSTJST → UTCKST → UTCJST → ESTKST → PSTJST → CSTKST → GMTView All