After you file

I'm not sure what you mean by "date on the bottom."    If you were printing from a browser, a page often has the date and time at the bottom (or for some people the top) for anything you print out from a browser even at other websites.    Do all pages have a date on them at the bottom?   If every page has a date on them, it sounds like a browser or some other type of setting issue.   

Or was this a date provided by TurboTax?  
What is the date shown on your Electronic Postmark?   On that page the date appears in the body of the report.   I don't know if you can view it yet.  You may have to wait until your returns are accepted to check that form.