具体的时间前面要加什么介词吗?比如 I came to ShangHai 12th July.和 I came to ShangHai in 12th July.哪个对?还是都错,最好怎么说?这里不要任何介词可以吗？直接说 I came to ShangHai 12th July.

具体的时间前面要加什么介词吗?比如 I came to ShangHai 12th July.和 I came to ShangHai in 12th July.哪个对?还是都错,最好怎么说?这里不要任何介词可以吗？直接说 I came to ShangHai 12th July.
具体的时间前面要加什么介词吗?
比如 I came to ShangHai 12th July.和 I came to ShangHai in 12th July.
哪个对?还是都错,最好怎么说?
这里不要任何介词可以吗？直接说 I came to ShangHai 12th July.

具体的时间前面要加什么介词吗?比如 I came to ShangHai 12th July.和 I came to ShangHai in 12th July.哪个对?还是都错,最好怎么说?这里不要任何介词可以吗？直接说 I came to ShangHai 12th July.
是用on
月日之前用on
年代或月份之前用in
如不懂,可再问.!
补充：我上面已经说得很清楚了,要用介词,不能不用~!
希望给分,!

具体的某一天是on,I came to ShangHai on 12th July
模糊的时间是in ，如 in the weekend ,慢慢积累吧