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I could say "I am leaving the day after tomorrow," but what if I want to reference the night before last night? Do I say, "I left the night before last night"? What do native speakers say both formally and informally in particular? I researched the question but could not find a clear definite answer, and I do not want to speculate.
1You can also say: two nights ago. Or 3/4/... nights ago. – None – 2016-05-25T18:29:04.673
5note in many languages there are specific words for "day after tomorrow" or "day before yesterday", but not in English - don't seek them in vain. – SF. – 2013-11-15T10:06:34.440