Japon – JST toute l’année, pas d’heure d’été
Japan runs on Japan Standard Time (JST, UTC+9) year-round across the entire country. DST was tried briefly after WW2 (1948-1952) but abandoned as unpopular. JST is the same offset as Korean Standard Time (KST). Business hours 9 AM - 6 PM formally, with strong presence culture — staying past 7-8 PM is common. Japan's no-DST policy makes cross-Asia coordination unusually clean.