AC 850 then BA 932 at Heathrow
Calgary → London → Düsseldorf
Timetable, London time
09:20AC 850 from Calgary at the gate
09:15BA 932 to Düsseldorf leaves the gate
23 h 55 apart on the timetable, overnight
BA 932 leaves 23 h 55 after AC 850 arrives on the timetable: more than half a day, so not a connection we count.