Are you sure you can use Wp7EasyBackup to restore your ROM backup to a new ROM? I use the same utility but not across different ROM. I cannot comment on the date/time stamp though. I successfully restored the Store.vol & PimIndex.vol from my HD7 to my Samsung Focus (v.1.3) & the date/time stamp was preserved. Only issue I observed was the SMS did not associate with the contact database thus I was not able to view my contact's SMS from within the contact...but this is expected.
Hello konker!
This wasn't a ROM backup but applications' backup: in fact, I had a look into each directory in my laptop and found IsolatedStore directory for each application with content inside...