Question

Wch is correct (at 11 pm or on 11pm)

Answer 1

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At 11 pm is correct.

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Answer 2

ANSWER:

At 11:00 pm is correct.

EXPLANATION:    

Preposition precedes a noun or pronoun to relate another word. The preposition at is used to represent the exact or precise time.

At is used before timings like 3 o’clock, 10.00 pm whereas on is used to represent the days or weekend. On is used before days, weekend etc. Since 11:00 pm indicates the particular time in a day, the preposition at is used before 11.00 pm instead of on.