I was recently looking at the academic schedule of my future employer, 北大 (Běidà, or Peking University). The fall semester starts on 9 月18 日 (September 18). What I am curious about is why is the date written as 18 日? I've always been taught that you would say 9 月18 号(jiǔ yuè shíbā hào). Did I just learn this wrong? Or is there some simple explanation, like the difference between written and spoken Mandarin? Or is it something else altogether?
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