Augustine of Hippo — as excerpted in the Catena Aurea on John 7:14-18

“(Tract. xxviii. s. 8.) The feast seems, as far as we can judge, to have lasted several days. And therefore it is said, “about the middle of the feast day:c” i. e. when as many days of that feast had passed, as were to come. So that His assertion, I go not up yet to this feast day, (i. e. to the first or second day, as you would wish me,) was strictly fulfilled. For He went up afterwards, about the middle of the feast.”