After my latest laptop update:

ldo@vodell:~> conv-date now '' Asia/Seoul Asia/Pyongyang Pacific/Auckland........: Tue Aug 25 17:58:22 NZST 2015 Asia/Seoul..............: Tue Aug 25 14:58:22 KST 2015 Asia/Pyongyang..........: Tue Aug 25 14:28:22 KST 2015

North Korea only announced its new time zone two weeks ago. What other OS could be this quick without any actual code patches?