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