South Korea has one timezone, Korea Standard Time (UTC+09:00), which
is abbreviated KST.
South Korea does not currently observe
daylight saving time, but experimented with it during the 1988 Summer
Olympics in Seoul.
North Korea used Korea Standard Time until
2015, when it adopted Pyongyang Standard Time (UTC+08:30).
In 1434, inventor
Jang Yeong-sil developed Korea's first automatic
water clock, which King Sejong adapted as Korea's standard timekeeper.
It is likely that Koreans used water clocks to keep time prior to this
invention, but no concrete records of them exist. In 1437, Jang
Yeong-sil, with Jeong Cho, created a bowl-shaped sundial called the
angbu ilgu (Hangul: 앙부일구), which King Sejong had placed in
public so anyone could use it.
In 1908, the
Korean Empire adopted a standard time that was 8.5 hours
ahead of UTC (UTC+08:30). In 1912, during the Japanese occupation of
Governor-General of Korea
Governor-General of Korea changed standard time to
UTC+09:00 to align with Japan Standard Time. However, in 1954, the
South Korean government under President
Syngman Rhee reverted the
standard time to UTC+08:30. Then in 1961, under the military
government of President Park Chung-hee, the standard time was changed
back to UTC+09:00 once again.
In order to accommodate American television viewers, South Korea
observed daylight saving time when
Seoul hosted the 1988 Summer
Olympics. The one-hour time change meant that many daytime events
could be broadcast live from
South Korea when it was prime time on the
U.S. east coast.
On August 15, 2015,
North Korea reverted its standard time zone to
UTC+08:30 to coincide with the
National Liberation Day of Korea
National Liberation Day of Korea from
Japan. The North Korean government said it decided to revert to the
standard time Korea used before the Japanese occupation began in 1910
in order to break away from the "wicked Japanese imperialists." The
time zone is known as Pyongyang Standard Time.
IANA time zone database
IANA time zone database
IANA time zone database contains one zone for
South Korea in the
file zone.tab, named Asia/Seoul.
^ "표준시" [Standard Time]. Doosan Encyclopedia (in Korean).
^ "KST". Geospatial Information System Glossary (in Korean). Retrieved
^ a b Chad, Norman (1987-01-30). "Live From Seoul, 1988 Olympics Now
Are Ready For Prime Time". Washington Post. ISSN 0190-8286.
^ Chappell, Bill (2017-03-29). "The Olympics' TV Time-Delay Is Going
Away, NBC Says". National Public Radio. Retrieved 2018-03-03.
^ a b "Turning back the clock:
North Korea creates Pyongyang Standard
Time". Reuters. 2015-08-07. Retrieved 2018-03-03.
^ Pak, Sŏng-nae (2005). Science and Technology in Korean History:
Excursions, Innovations, and Issues. Jain Publishing Company.
pp. 96–99. ISBN 0895818388.
^ Park, Changbom (2008). Astronomy: Traditional Korean Science. Ewha
Women's University Press. p. 135. ISBN 8973007793.
^ Yu, Jeong-in (2010-08-09). "1961년 표준자오선 동경 135도로
변경" [1961 Standard Meridian Changed to 135 Degrees East]. The
Kyunghyang Shinmun. Retrieved 2018-03-03.
^ "North Korea's new time zone to break from 'imperialism'". BBC News.
2015-08-07. Retrieved 2018-03-03.
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