Seoul
Tokyo
Convert KST to JST
Korea Standard Time to Japan Standard Time — Tokyo is 0 hours ahead of Seoul
Quick Facts
Time Difference
+0 hours
KST Full Name
Korea Standard Time
JST Full Name
Japan Standard Time
KST to JST Conversion Table
Related Conversions
About KST and JST Time Zones
KST (Korea Standard Time) is UTC+9 and covers cities like Seoul, Busan, Incheon. JST (Japan Standard Time) is UTC+9 and covers cities like Tokyo, Osaka, Kyoto.
When it's 12:00 PM (noon) in Seoul (KST), it's 12:00 PM in Tokyo (JST). The time difference between KST and JST is 0 hours — Tokyo is ahead of Seoul.
With only a 0-hour difference, Seoul and Tokyo share nearly a full business day overlap, making scheduling straightforward.
Use our world clock tool to compare Seoul and Tokyo with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between KST and JST?
Tokyo (JST) is 0 hours ahead of Seoul (KST). The offset is +0 hours.
Is JST ahead or behind KST?
JST is 0 hours ahead of KST. KST is UTC+9 and JST is UTC+9.
When it's 12:00 PM in Seoul, what time is it in Tokyo?
When it's 12:00 PM (noon) in Seoul (KST), it's 12:00 PM in Tokyo (JST).
When it's 5:00 PM in Seoul, what time is it in Tokyo?
When it's 5:00 PM in Seoul (KST), it's 5:00 PM in Tokyo (JST).