Rashi on Genesis
ויהי כהיום הזה AND IT CAME TO PASS ON A CERTAIN DAY — This means as much as “and it came to pass when a certain distinguished day arrived” — a day of merriment, a day of their sacred feast when they all went to the temple of their idols, — she said), “I shall find no day fitting to associate with Joseph as this day”. She therefore told her attendants I am sick and cannot go to the temple (Sotah 36b).
Radak on Genesis
ויהי כהיום הזה, a day, quite similar to this day, when she insistently urged him to sleep with her, occurred. Now a different day occurred when the house was empty of all its other occupants