Do I really need to wait 4 hours between coats of paint?
Both are grammatically correct, but they are used in different contexts. You should use "in June" when referring to the month as a whole or a span of time, such as "My birthday is in June." Conversely, you use "on" when referring to a specific day or date within that month, such as "The event is on June 12th." Essentially, if you are mentioning a specific date, you must use "on"; if you are speaking about the month generally, "in" is the standard choice.
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