The first page is 2015 Biff giving 1955 Biff the almanac in his car in his garage. It then has, the next day, Biff lying on the couch with a bump on his right cheek, with his Grandmother saying he smells like manure, meaning it had to be a small while after the "big chase" between Biff and his goons and Marty on his wooden skateboard. But in BttF2, the two Biffs were shown talking on the day before the night of the Enchantment Under the Sea Dance, and right before '55 Biff found 2015 Biff in his car (with Marty hiding behind the backseat this time), he hassled Lorraine, who had just picked out her dance dress, about her going to the dance with "Calvin Klien." Is there something I'm not getting here?
If old Biff visited young Biff on the morning of the dance, then the next day would be after George and Marty #2 punched Biff at the dance and then Biff chased Marty 2 through the tunnel on the hoverboard and crashed into the manure truck the second time.