It’son...和It’sonthe...这两个句型在回答日期时,怎么区别?例如,用When’syourbirthday?提问,用It’son...和It’sonthe...这两个回答问题有什么不一样?区别在哪儿?希望说得系统点并且详细一点.

Question

It’s on ...和It’s on the...这两个句型在回答日期时,怎么区别?
例如,用When’s your birthday?提问,用It’s on ...和It’s on the...这两个回答问题有什么不一样?区别在哪儿?希望说得系统点并且详细一点.

Answer 1

It's on...接具体的某一天.如：
It's on Tuesday/ May 1st/Women's Day.
It's on the...接具体某一天的上午、下午或晚上.如：
It's on the morning of Tuesday.
It's on the afternoon of May 1st.
It's on the evening of Women's Day.
It's on the night of Children's Day.
It's on the...也可以用在用序数词表示的具体某一天的前面,或有形容词修饰的具体某一天的前面.如:
It's on the third day of March.
It's on the meaningful/unforgettable day.
你给出的例子It's on the 19th of September.也是属于这种用法.