Either is correct depending on the context of the sentence. On october 还是 in october？应该是用in，时间介词in后接年，月，季节on后接日期，星期，以及具体某天的早上，下午和晚上october是月份，所以用in Before the julian reforms to the calendar, the year began in march.
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The month of october gets its name from the latin octo, meaning eight.
英语9月september，便由此演变而来。 3、october。 英语10月，来自拉丁文 octo，即“8”的意思。 它和上面讲的9月一样，历法改了，称呼仍然沿用未变。 4、december，罗马皇帝琉西乌.
Use 'on october' to specify a specific day in october.
