Well, I am only updating the date. I have other pictures treated the same, without problems.
This is the content of the Caption field (after applying the stationary pad):
weggetje op de Huizermeent
location: Huizen, Meent richting Blaricum
N52°17.063' - E5°15.799'
capture date: 19-3-1969
Diascan Nikon LS-40
No free use
Copyright by Rob Versteeg
r.c.l.versteeg@planet.nl
So there should be a valid capture time.
When I change the date (not the time) to: januari 1 1970 it is sorted correcty (in front of the row; oldest cature time)
Rob