City comparison · time difference and converter
Shanghai is 12 hours ahead of Manaus right now. Manaus sits in Brazil on Manaus; Shanghai sits in China on Shanghai. They are roughly 16,883 km apart (10,491 mi), a flight of about 20h 52m. Manaus's metro holds around 2.2 million people; Shanghai's around 26.3 million.
Slot 1
00:00 / 12:00
Manaus / Shanghai
Partial overlapSlot 2
01:00 / 13:00
Manaus / Shanghai
Partial overlapSlot 3
02:00 / 14:00
Manaus / Shanghai
Partial overlapEach row is one hour in Manaus. 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
Shanghai, China · 端午节
Fri, Jun 19
Great-circle distance
16,883 km
(10,491 mi)
Approximate flight
20h 52m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
12h
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 Manaus and Shanghai is not really a number, it's a daily rhythm. Shanghai is 12 hours ahead of Manaus on the clock today, but the lived version is that Shanghai is wrapping up the working day while Manaus is still in the morning, and the overlap people actually use is narrow. That gap, more than the raw offset, is what teams have to design around.
In Manaus, the working day picks up earliest in the financial districts — Manaus's downtown core wakes early and breaks for lunch at the usual hour. The mood in Shanghai is its own story: Shanghai settles into the evening at the usual hour, with the local commuter pattern setting the pace. 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. Brazil either observes DST or holds a fixed offset year-round; China either follows its region's DST pattern or stays put all year. When the two changes are weeks apart, the offset between Manaus and Shanghai 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 20h 52m 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 12-hour gap costs about 12 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.