Shanghai — CST (China), no DST
Shanghai runs on China Standard Time (CST, UTC+8) year-round — same offset as the entire Chinese mainland. No DST. Business hours 9 AM - 6 PM in coastal Shanghai, often "996" (9 AM - 9 PM, 6 days a week) in Chinese tech — though this has legally been challenged and is less overt than a decade ago. SSE (Shanghai Stock Exchange) trading runs 9:30 AM - 3 PM CST with a 1.5-h lunch break.