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AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

Time in Constanţa vs Guangzhou

Constanţa keeps EEST (UTC+3) and Guangzhou keeps CST (UTC+8) today. Guangzhou is 5 hours ahead of Constanţa; the rows below read both clocks live.

The working day, side by side

Hours shaded in both rows are inside working hours in both cities: 14:00–18:00 in Guangzhou (09:00–13:00 your time).

Constanţa and Guangzhou hour by hour, with the working-hour overlap shaded
City00:00 in Constanţa01:00 in Constanţa02:00 in Constanţa03:00 in Constanţa04:00 in Constanţa05:00 in Constanţa06:00 in Constanţa07:00 in Constanţa08:00 in Constanţa09:00 in Constanţa10:00 in Constanţa11:00 in Constanţa12:00 in Constanţa13:00 in Constanţa14:00 in Constanţa15:00 in Constanţa16:00 in Constanţa17:00 in Constanţa18:00 in Constanţa19:00 in Constanţa20:00 in Constanţa21:00 in Constanţa22:00 in Constanţa23:00 in Constanţa
Constanţa——000102030405060708091011121314151617181920212223
Guangzhou——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Constanţa and Guangzhou

Open in the PlannerAdd more cities, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep Constanţa, Guangzhou and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

09:00 in Constanţa
Inside working hours on both sides
14:00 in Guangzhou
10:00 in Constanţa
Inside working hours on both sides
15:00 in Guangzhou
11:00 in Constanţa
Inside working hours on both sides
16:00 in Guangzhou
12:00 in Constanţa
Inside working hours on both sides
17:00 in Guangzhou

Where daylight saving pulls them apart

Constanţa next changes on Sunday 25 October 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.

Also useful

Common questions

How many hours ahead is Guangzhou of Constanţa?

Guangzhou is 5 hours ahead of Constanţa right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Constanţa and Guangzhou?

Any hour in 09:00–13:00 Constanţa time is inside working hours in both cities.

Do Constanţa and Guangzhou change clocks on the same date?

Only one of them does, so the gap between them changes twice a year even though neither city moved relative to the sun.