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Luis arrived in the United States in June 2002.
He started school on August 29th.

Why June is used with 'in' and August is used with 'on'?

marked as duplicate by WS2, Mustafa, Cascabel, Drew, Edwin Ashworth Apr 23 '17 at 21:45

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'in' is used where the date is not specific... According to the sentence, Luis might have arrived on any date in June but he joined school 'on' a specific date i.e. 29th August. For specific time 'at' is used. All these are prepositions.

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