子夜,亦稱午夜半夜子正,指二十四小時制的00:00(24:00)或十二小時制的夜晚12:00。中國古代以子夜為日之分界,以子正初刻(00:00)為一日之開始,夜子初四刻(24:00,子夜)為一日之終結[1]。而且分一日十二時辰子時即為現代二十四小時制的前一日23:00至01:00(十二小時制的前一日夜晚11:00至凌晨1:00)[2][3]

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