Past perfect and time marks

[Palych]

Is it correct to say:

"He worried because he had leaved the office at 6.10 p.m., but it was not allowed to stay there after the end of the working day (6p.m.)"

[Mister Micawber]

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No. I suggest:

He worried because he had left the office at 6.10 pm, although he was not allowed to stay there after the end of the work day (6 pm).
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Native English teacher at Mister Micawber's