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Hmmm... there is no 12pm? There's 11:59pm and then comes 00:00 (which I'm not sure wether it is AM or PM)?

Is that somewhat correct?

It goes 11:59pm then 12:00am 12:01am ... 12:59am ... 1:00am ... 11:59am 12:00pm so there are 13 hours from 11pm to 12 pm.