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I cannot filter on the TIME an RGS event file produced with a former SAS version. What am I doing wrong?

Actually nothing. In all SAS versions previous to SAS 6.5 the RGS event list headers lack the TUNIT keyword corresponding to the TIME column. In this case the use of evselect for time filtering is not possible.

The problem dissapears if the TUNIT1 keyword:
TUNIT1 = 's ' / physical unit of field

is added to the first header of the event file. This can be done with various S/W packages. Using FTOOLS for instance by issuing a command:

#> fmodhead events.FIT htemp.dat

where events.FIT is the event list file and htemp.dat a text file including just following line:

TUNIT1 's' / physical unit of field