Is today the 29th?

This happened, obviously, two days ago.


Student [Cathy Brooks]: "Is today the 29th?"

Me: "I believe so."

Cathy: "Is today the 29th?"

I check my watch. "Yes."

Cathy: "It’s the 29th?"

Me: "It is."

Cathy: "It’s the 29th."

Silence.

Cathy: "Dang I thought it was the 28th. It’s the 29th. I been puttin’ 28th on
all my papers."


Later, a different student, who was sitting across from Cathy :


"Is Friday Halloween? Ah, so today's the 29th."