是in July the first,2010还是on July the first,2010?

问题描述:

是in July the first,2010还是on July the first,2010?

是on July the first,2010. 相当于是on July 1st ,2010.

on July the first,2010。在具体的某一天介词用on

on
有具体年月日、或月日的用on,只有年月或月或年的用in
比较:on July the second 2010,on July the second
in July 2010,in July