The second source says for 25.Mar.96:
16:01 - 22:45 h, "intercal 001 (QS)"
The third source says for 25.Mar.96:
21:05 h, "@19:00 Schuehle intercal_1.obj; intercalibration CDS & EIT"
The relevant entries in the FITS files' headers (program name, science objectives etc.) show blanks and zeros for the whole day.
But other parts of the FITS files show that some UDP#12 ran between 19:00 and 20:55 h, doing a raster in various wavelengths, so I think I identified it.
Now, this was an easy example. Sometimes the days differ, sometimes there is nothing at all. (P.S.: It is getting better after May.96, though.)