City comparison · time difference and converter
Ulsan is 3 hours ahead of Dhaka right now. Dhaka sits in Bangladesh on Dhaka; Ulsan sits in South Korea on Seoul. They are roughly 3,949 km apart (2,454 mi), a flight of about 5h 39m. Dhaka's metro holds around 22.4 million people; Ulsan's around 1.1 million.
Slot 1
09:00 / 12:00
Dhaka / Ulsan
Both inside business hoursSlot 2
10:00 / 13:00
Dhaka / Ulsan
Both inside business hoursSlot 3
11:00 / 14:00
Dhaka / Ulsan
Both inside business hoursEach row is one hour in Dhaka. 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.
Local Election Day
Ulsan, South Korea · 지방 선거일
Wed, Jun 3
Memorial Day
Ulsan, South Korea · 현충일
Sat, Jun 6
Great-circle distance
3,949 km
(2,454 mi)
Approximate flight
5h 39m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
3h
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 Dhaka and Ulsan is not really a number, it's a daily rhythm. Ulsan is 3 hours ahead of Dhaka on the clock today, but the lived version is that Ulsan is wrapping up the working day while Dhaka 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 Dhaka, the working day picks up earliest in the financial districts — Dhaka's downtown core wakes early and breaks for lunch at the usual hour. The mood in Ulsan is its own story: Ulsan 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. Bangladesh either observes DST or holds a fixed offset year-round; South Korea either follows its region's DST pattern or stays put all year. When the two changes are weeks apart, the offset between Dhaka and Ulsan 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 5h 39m 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 3-hour gap costs about 3 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.