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I’m often confused when I speak about times and dates. What is the rule for using on, in, and at in the following sentences?

  • I will do it ___ Tuesday.
  • We married ___ March.
  • He returned ___ the same day.
  • Every day ___ the same time, I walk the dog.
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up vote 23 down vote accepted

Times usually get at.

Everyday at the same time I take a walk.
At 3 PM, I will be having a late lunch.

Days usually get on.

I will do it on Tuesday.
He returned on the same day.

Months usually get in.

We married in March.

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From what I know, confirmed by here:

  • at for a precise time;
  • in for months, centuries, years;
  • on for days and dates;

Though I have seen at for days in the plural (e.g. at Mondays), but it looks rather informal in my opinion.

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I've also seen "at Mondays", but usually in the writing of someone whose first language was something other than English. – barbara beeton Jan 23 '13 at 21:53

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