How can I unify different time zones (GMT,MEZ,...) in Aperture

I scanned older negative films, diapositives and fotoprints and added date and time.

I did it in iPhoto and Aperture and now I have different times like:

10.04.66 10:00:00

10.04.66 10:00:00 MEZ

10.04.66 10:00:00 MESZ

10.04.66 10:00:00 GMT

10.04.66 10:00:00 GMT+1

10.04.66 10:00:00 GMT+3

When I try to sort them by date Aperture considered the different time zone ans I can't get a useful order of my images.

Is there any way to set all times to one time zone in Aperture?

How can I unify different time zones?