To turn comments off on pages, but not on posts, open each page (about, etc.) in the editor, click the screen options tab at upper right on that page and make sure that the “discussion” module is active, then scroll down below the text area and in the “discussion” module deselect both comments and trackbacks and then save or update the page.
That is strange that a date is showing on pages such as the about page. No other theme here shows dates on pages, so it could have been an oversight by staff. I’ll tag this thread to have it moved to the themes forum and hopefully one of the theme team will see it and respond.