Both are fine, except that 'o'clock' should not be capitalized.
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Anonymoushi !the second one is correct,present perfectMr M has already said that the first is also correct. It is correct in AmE.
grammarfreakActually, both are incorrect as written because of the comma spliceGood point. I thought it was a full stop.
Mister Micawber I thought it was a full stop.Me too. I need new glasses.