[3] From May 8 to October 9 in 1988, daylight saving time was tested to better accommodate the calendar of competitions held during the 1988 Summer Olympics in Seoul.
[6] In 1437, Jang Yeong-sil, with Jeong Cho, created a bowl-shaped sundial called the angbu ilgu (앙부일구), which King Sejong had placed in public so anyone could use it.
[7] Geographically, the western parts of Korea, including the South Korean capital city, Seoul, are GMT+08:00.
However, in 1954, the South Korean government under President Syngman Rhee reverted the standard time to GMT+08:30.
[8] In order to accommodate American television viewers, South Korea observed daylight saving time (GMT+10:00) when Seoul hosted the 1988 Summer Olympics.