Question

1. I arrived at the hospital at 7 p.m.

2. I arrived at the hospital at around 7 p.m.

3. I arrived at the hospital around 7 p.m.
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Can we use all the expressions?
Can we use 'at around' as in Sentence 3?

Answer 1

Yes to both questions.

Answer 2

1. I arrived at the hospital at 7 p.m.

2. I arrived at the hospital at around 7 p.m.

3. I arrived at the hospital around 7 p.m.
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Can we use all the expressions?
Can we use 'at around' as in "Sentence 2"? Thank you. You mean all are grammatical?

Answer 3

The word "at" means right at that hour, so "at 7 p.m." means it! The word "around" means close to that hour, maybe a few minutes before or after.

While "at around" is not really incorrect, it is rather self-contradictory!! I would use either "at" or "around," but you can use any of the three expressions.