Brussels runs on Central European Summer Time right now. That is CEST, UTC+2. Hong Kong never changes its clocks. It stays on Hong Kong Time (HKT, UTC+8) all year. The gap sits at 6 hours. When it is 09:00 in Brussels, it is 15:00 in Hong Kong.
Winter rewrites the arithmetic. Brussels falls back to Central European Time (CET, UTC+1) while Hong Kong holds steady. The gap stretches to 7 hours. A 09:00 Brussels morning becomes 16:00 in Hong Kong.
When does Brussels jump to 6 hours ahead of Hong Kong?
Brussels switches to CEST on the last Sunday of March. In 2026, that is 29 March. It stays on summer time until 25 October. For those seven months, Hong Kong leads by exactly 6 hours.
The business-day overlap is punishingly short. Hong Kong desks open at 09:00 HKT. That is 03:00 in Brussels. Nobody is awake. Brussels desks open at 09:00 CEST. That is 15:00 in Hong Kong, the final stretch of their afternoon. The only workable window is 09:00 to 11:00 Brussels time, which maps to 15:00 to 17:00 in Hong Kong. After 11:00 Brussels, Hong Kong is logging off.
When does Brussels drop to 7 hours behind Hong Kong?
Brussels reverts to CET on 25 October 2026. The offset becomes 7 hours. It stays that way until 28 March 2027.
Now 09:00 in Brussels is 16:00 in Hong Kong. The overlap shifts earlier and shrinks. Aim for 08:00 to 10:00 Brussels time. That gives you 15:00 to 17:00 in Hong Kong. After 10:00 Brussels, Hong Kong offices are closing their doors.
When does the Brussels, Hong Kong gap change next?
Sunday 25 October 2026. At 03:00 local time, Brussels clocks fall back to 02:00. The difference jumps from 6 hours to7 hours overnight.
Check every recurring meeting that weekend. A call locked to Brussels time suddenly lands an hour later in Hong Kong. The 6-hour summer rhythm you had been working with vanishes in one night.