On 15 July 2026, Tokyo is 7 hours ahead of Brussels. On 15 January 2026, Tokyo is 8 hours ahead. The gap shifts because Belgium changes its clocks twice a year. Japan never does.

Noon in Brussels means 19:00 or 20:00 in Tokyo.

Tokyo Is 7 Hours Ahead When Brussels Is on CEST

From the last Sunday of March through the last Sunday of October, Brussels runs on Central European Summer Time (CEST, UTC+2). Japan Standard Time (JST) is fixed at UTC+9 all year. The gap is 7 hours.

09:00 in Brussels is 16:00 in Tokyo. A 10:00 Brussels meeting starts at 17:00 Tokyo time. This is the easier window. Brussels starts its morning while Tokyo is still in its late afternoon.

Tokyo Is 8 Hours Ahead When Brussels Is on CET

When Brussels switches back to Central European Time (CET, UTC+1) in late October, the difference widens to 8 hours.

Now 09:00 in Brussels is 17:00 in Tokyo. A 10:00 call hits 18:00 in Japan. The working day in Tokyo is ending just as Brussels gets going. Winter scheduling demands tighter timing. Book someone at 19:00 Tokyo time and you have already lost them.

Why Japan Stays on One Clock While Brussels Shifts

Japan adopted daylight saving time during the Allied occupation after World War II, abolished it in 1952, and has never reinstated it. The government considered a return after the 2011 Fukushima disaster as an energy-saving measure. The proposal was dropped. Japan stays on JST (UTC+9) every day of the year.

Only Brussels moves. When Belgium advances its clocks on the last Sunday of March, Tokyo suddenly becomes 7 hours ahead instead of 8. When Belgium sets them back on the last Sunday of October, the 8-hour gap returns.

Best Meeting Windows for Brussels, Tokyo Calls

The overlap between a standard Brussels workday and a standard Tokyo workday is thin. It is usable.

Summer (CEST, 7-hour gap): 08:00-10:00 Brussels equals 16:00-18:00 Tokyo. Aim for 09:00 Brussels, 16:00 Tokyo. Both sides are awake and productive.

Winter (CET, 8-hour gap): 08:00-10:00 Brussels equals 17:00-19:00 Tokyo. The window shrinks. A 09:00 Brussels start lands at 17:00 Tokyo. Keep it short.

The worst slot? Brussels afternoon, 14:00-17:00. That lands in Tokyo at 22:00-01:00. Do not book then.

Jet Lag on the Brussels, Tokyo Route

Flying east from Brussels to Tokyo means losing 7 or 8 hours. This is the harder direction. Your body wants to sleep when Tokyo is waking up.

The flight from Brussels Airport (BRU) to Narita or Haneda typically departs in the morning and arrives the next afternoon local time. You land in Tokyo with a full day ahead. Stay awake until a reasonable local bedtime. Get sunlight as soon as you arrive.

Westbound, Tokyo to Brussels, is easier. You gain hours and arrive in the afternoon. Most travellers adjust within a day or two.

One group should ignore the morning-call advice: remote workers in Brussels whose company operates on Tokyo time. If your team is in Japan, you might need to start at 06:00 or 07:00 Brussels time to overlap with Tokyo's core hours. That is a 05:00 or 06:00 start in summer. Do it only if your role demands real-time collaboration. For everyone else, the 09:00 Brussels window is the safest bet.