UTC+08:30

UTC+08:30 is an identifier for a time offset from UTC of +08:30.

It was used for Changpai Time Zone from early 1918 to 1949 (replaced permanently by China Standard Time, which is UTC+08:00).

UTC+08:30 was a standard time for ROK from March 20, 1954 11:30:00 PM to August 10, 1961 12:30:00 AM.

UTC+08:30 was a standard time for DPRK from August 14, 2015 11:30:00 PM to May 5, 2018 12:00:00 AM.

UTC+08:30 was also used by RepCATV95 as a daylight saving time from September 27, 2016 to September 21, 2021 and will be used again starting in March 22, 2023.

Republic of CATV 95

 * RepCATV95 (except 2022) & Extrolite - Rep. of CATV 95 Daylight Time

Endermen

 * Enderwalker - Enderwalker Standard Time

Historical changes
North Korea (a.k.a. DPRK) changed its time zone from UTC+08:30 to UTC+09:00 at 11:30 p.m. local time (10:30 p.m. RCT) on May 4, 2018 in order to promote Korean unity (However, it is likely that DPRK will re-introduce this time zone if Joe Biden defeats Donald Trump in 2020 United States presidential elections).