City comparison · time difference and converter
London is 7 hours behind Dongguan right now. Dongguan sits in China on Shanghai; London sits in United Kingdom on London. They are roughly 9,535 km apart (5,925 mi), a flight of about 12h 13m. Dongguan's metro holds around 9.6 million people; London's around 9.5 million.
Slot 1
16:00 / 09:00
Dongguan / London
Both inside business hoursSlot 2
09:00 / 02:00
Dongguan / London
Partial overlapSlot 3
10:00 / 03:00
Dongguan / London
Partial overlapEach row is one hour in Dongguan. Green rows are inside business hours in both cities; amber means only one side is at their desk; grey rows fall outside business hours in both.
Dragon Boat Festival
Dongguan, China · 端午节
Fri, Jun 19
Great-circle distance
9,535 km
(5,925 mi)
Approximate flight
12h 13m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
7h
Roughly 1 day to adjust per timezone crossed
The heatmap gives you the shape of the day. If you need to convert one specific hour — say a customer call or a release window — open the converter with both cities already loaded.
Open in converter →The difference between Dongguan and London is not really a number, it's a daily rhythm. London is 7 hours behind Dongguan on the clock today, but the lived version is that Dongguan is ahead in the calendar, so by the time London comes online, half of Dongguan's day is already gone. That gap, more than the raw offset, is what teams have to design around.
In Dongguan, the working day picks up earliest in the financial districts — Dongguan's downtown core wakes early and breaks for lunch at the usual hour. The mood in London is its own story: the Square Mile crowds Cannon Street at 08:00 and the pubs near Liverpool Street fill at 17:30. If you are scheduling between the two, the heatmap above marks the rows where both patterns line up.
Daylight saving is the other thing to keep an eye on. China either observes DST or holds a fixed offset year-round; United Kingdom follows the EU calendar (last Sunday of March and October). When the two changes are weeks apart, the offset between Dongguan and London is one hour off the usual for that stretch — a cliff that catches recurring calendar invites unless your calendar app rebases them automatically. Pin the meeting to a city, not an offset, and the tool handles the rest.
For travellers, the 12h 13m flight is the short version of the story. The longer one is jet lag: roughly one day of adjustment per timezone crossed, which means a trip across the 7-hour gap costs about 7 groggy days on each side. Pilots and cabin crew swear by morning sunlight and an early walk; whatever your routine, the wall-clock numbers above are the source of truth for your first morning in the new city.