Why don't you check the actual page url at archive.org? It won't be completely accurate, but you will get an idea of when it was first cached.
theres no reliable way but in the header the server sometimes tells you when a page was last modified.. ex. in firefox right click -> page info -> page last modified, though this doesn't work for dynamic pages. As far as creation date archive.org is your best bet.. you'll need a script to hit they're site and see
First of all, thanks for your assistance!! * I checked in FF but then it says last modified today, so unfortunately this isn't working. * yesterday i found the link to archive.org here in DP and i tried this for the first time. It says that the first date is Dec 14, 2004 and several in 2005 but non in 2006, kinda strange to me. I never used this so i can't tell if this is normal or correct. Can i now make of it that the page is created in 2004?