On, At and In (Time)
Incorrect : I flew to London at/in Thursday.
Correct: I flew to London on Thursday.
Incorrect : He usually goes to bed on/in 11 o'clock.
Correct : He usually goes to bed at 11 o'clock.
Incorrect : Alan was born at/on February.
Correct : Alan was born in February.
Note: "On' is used before the days of the week or month : on Sunday, on 9 February, on the Eid day etc. “At' is used with the exact clock time : at 2 o'clock, at Sunset, at midnight etc. And “in” is used with a period of time: in February, in winter, in 1999, in the morning etc.
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