I was born in the morning of July 21.(哪里错了)

问题描述:

I was born in the morning of July 21.(哪里错了)

应改成I was born in the morning of July the 21st.

I was born in(ON) the morning of July 21.
at night
on a rainy night
in the evening
on Sunday evening
有具体修释语时,要用ON.

具体日期用on不是in