I've come across this expression while having a conversation over the phone with a native English speaking friend. However, I am not sure if he said "at the day after tomorrow" or "the day after tomorrow".

Can this expression be used as a adverb?


The day after tomorrow, like today, tomorrow, yesterday, this morning, tonight, next week and last year does not usually take a preposition, so yes, it is usually used as an adverbial phrase.

Some temporal phrases do require a preposition (eg in 2015, in March), and for some a preposition is optional (eg on Tuesday vs Tuesday. The form without a preposition feels more colloquial to me, but I think it is more established in American English than in British).

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    Even if it did take a preposition, the preposition would not be 'at'. In some contexts you might say, "on the day after tomorrow" Also you can say 'by the day after tomorrow'. – chasly - reinstate Monica Oct 14 '15 at 0:12

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