KL 1920 then KL 1009 at Schiphol
Zurich → Amsterdam → London Heathrow
Timetable, Amsterdam time
13:35KL 1920 from Zurich at the gate
13:30KL 1009 to London Heathrow leaves the gate
23 h 55 apart on the timetable, overnight
KL 1009 leaves 23 h 55 after KL 1920 arrives on the timetable: more than half a day, so not a connection we count.