Hi Neil,
Happy to hear you are interested in Prelude.
It seems Prelude display the correct Create Date as it in Premiere Pro. Maybe different OS has its own way to show the created date and modified date. For example I tried to ingest and copy a GoPro clip both on Win7 and iMac. The created dates and modified dates I got are totally different. On Mac the created date is same as it is in Prelude, but on Win7 it doesn't. By the way what kind of media clip did you work on?
Best,
Lin