It wasn't so obvious to me because the chapter started by stating the date and time.

Okay, but there was this paragraph, which clearly indicated the groundhog attack had already happened:
"Hermione had even missed her Sunshine Regiment Official Planning Meeting, which seemed understandable enough; but when Susan had offered her sympathy afterward, Hermione had stammered that she'd lost track of time, which wasn't at all a usual thing for her to say, and the girl had looked exhausted and frightened like she'd just spent three days locked in a bathroom stall with a Dementor. "