It's Saturday 28th, according to the Heathrow timetable.
The flight number, KL1070, is a one-off, doubtless to commemorate the occasion. STA (as KL1079) is 17:20 local time, STD is 18:10.
That will leave Helvetic's occasional F100s, operating for Swiss, as the only Fokkers still scheduled at LHR.