Both are correct but each gives the sentence a different tone. "On the afternoon of February 2nd" sounds very formal. A lawyer might use this statement in the courtroom, as in: The suspect arrived at the bank on the afternoon of February 2nd." But if we were inviting someone to a party, we would probably say, "on February 2nd, in the afternoon" or "in the afternoon, on February 2nd." Usually in conversation, we us [on] with the date, but [in the] with morning, afternoon, or evening.

“On the afternoon of February 2nd “ is the correct construction

"In" is the correct answer. We us "in" when referencing months, years, seasons and parts of the day. E.g. Part of the day: "In the morning" Month: "In April" Year: "In 2021" Season: "In Autumn" We use "on" when referencing dates, days or special dates. E.g. Date: "On 2nd February" Day: "On Sunday" Special Date: "On your wedding"

“On the afternoon of February 2nd “ is the correct answer😊