Brussels is 4 hours behind Islamabad
Best overlap: 12:00 PM to 6:00 PM in Islamabad is 8:00 AM to 2:00 PM in Brussels.
Target 12:00 PM to 6:00 PM in Islamabad, which lands at 8:00 AM to 2:00 PM for the Brussels side. Brussels is 4 hours behind Islamabad, but you'd hardly notice — 6 hours of shared hours makes this feel like working in neighbouring time zones. Daylight saving complicates things slightly: Brussels observes it, Islamabad doesn't, so the difference flexes by an hour part of the year.