KST — Korea Standard Time

Korea Standard Time (KST) is nine hours ahead of Coordinated Universal Time and is used by South Korea. KST shares the same UTC+9 offset as Japan Standard Time, and the two countries' major cities of Seoul and Tokyo operate on the same clock. Seoul, the capital of South Korea and home to over 25 million people in its metropolitan area, is the primary city associated with KST.

South Korea is one of the world's largest economies and a global leader in technology, automotive manufacturing, and pop culture. Major Korean corporations including Samsung, Hyundai, LG, and SK operate on KST, and the Korea Exchange (KRX) in Seoul is one of Asia's most active stock markets. The time zone alignment with Tokyo facilitates extensive trade and communication between the two neighboring economies.

Korea Standard Time does not observe daylight saving time. South Korea used DST during the 1988 Seoul Olympics but has not used it since. North Korea briefly adopted its own time zone, Pyongyang Time (UTC+8:30), in 2015 as a symbolic break from Japanese colonial influence, but reverted to UTC+9 in 2018 to match South Korea ahead of inter-Korean summit talks.