7am 7 am 7a.m., 7 a.m. 7AM,7 AM,7A.M., 7 A.M. - which one do native speakers usually use?

English as a Second Language English Vocabulary, Grammar and Idioms
1

7am 7 am 7a.m., 7 a.m.
7AM, 7 AM, 7A.M., 7 A.M.

I think all the above are correct
But which one do native speakers usually use?

Thanks.

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2

As far as I can tell, 7am is the most commonly used version. Let’s see our native speakers have to say on the issue.

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3

Thanks, Torsten.

So far, no native speaker has responded.

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4

am

So what do you make of this? How do you interpret this screenshot?

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5

Thanks, Torsten.

I’m surprised that the advertisements use the capitalised version.

Can I conclude that most native speakers use this version?

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Actually, it’s not an ad but a directory listing. As for your question, I suggest you read this article: AM / PM | Common Errors in English Usage and More | Washington State University

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Better, we can say 7.00 hrs, 12.00 hrs, 14.00 hrs. 21.00 hrs, this can easily find AM/PM. It is only my opinion.(instead of confusing ourselves from AM/PM.

Thanks

S.Shanthi