Prepositons of Time: At, In, On

at in on
Exact time Long and short periods, years, months, and centuries Days and Dates
at 5 o'clock in July on Tuesday
at the age of in winter on the weekend
at night in the fall on 3 May
at lunch in 1997 on 12 Sept. 1996
at bedtime in the 1960s on National Day
at sunset in two centures, in two minutes on Eid Day
at midnight in the Middle Ages on my graduation day
at this moment in the past/future on Ramadan Eve
at present in the morning/evening/afternoon on Monday morning(s)/evening(s)/afternoon(s)

Look at these examples:
Correct
Wrong
I saw him last winterI saw him in last summer.
He will stop by this afternoon.He will stop by in this afternoon.
I'm going on vacation next weekend.I'm going on vacation on next weekend.
I visit my family every Eid.I visit my family at every Eid.
We don't use in, on, at when we use this, next, last, and every in sentences.

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