For my local work-related stuff, sure - I sort by date modified all the time. I don't much care when it comes to backups of media files.
But I'm puzzled - I've just mounted my home dir from an ancient RedHat 7.1 box on this G4 powerbook via AFP and copied across to it a file that came along as an attachment to an email today at 11:14. It's now 11:32 but the datestamp showing on the copied file is 11:14 as I'd expect.
OS X 10.4.11 at this end, netatalk afpd v1.6.4 on the Linux box. About as bog-standard as you can get (mainly 'cos I hate fscking around with netatalk's conf files).