Time Difference Between Hong Kong and London

Hong Kong is seven hours ahead of London for most of the year, which leaves a real overlap but at the wrong end of the Hong Kong day. London opening at 9 AM is 4 PM in Hong Kong, and by the time London has read its email it is past five in Central. The people staying late are almost always on the Hong Kong side, and banks and law firms staff for it deliberately, keeping desks that run London hours from Hong Kong. The gentler version is a London start at 8 AM, which catches Hong Kong at 3 PM and is an ordinary working hour for both. Anything scheduled in the London afternoon is a night call in Hong Kong.

Hong Kong keeps the same clock all year, so every shift on this pair comes from London. The gap is eight hours while London is on standard time, drops to seven when London springs forward on the last Sunday of March, holds there until the last Sunday of October, then returns to eight when London falls back. In practice that means the evening calls your Hong Kong colleagues already tolerate get an hour later every winter with nobody touching the invite. A 9 AM London standup that sat at 4 PM Hong Kong in September becomes a 5 PM meeting from late October, and that is usually the week someone asks to move it earlier.

The westbound flight runs somewhere around twelve hours nonstop, a little longer in the other direction. Going to London is the friendly leg: leave Hong Kong late morning, land in the late afternoon of the same calendar day, and you only have an evening to get through before a normal bedtime. Eastbound is what costs you. You lose the night in the air, arrive in Hong Kong in the early evening, and then wake at 4 AM for two or three days. People who fly this route often keep the first Hong Kong morning free on purpose and use it for reading rather than for anything that needs judgment.