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一段时间月日年都有用什么介词

My sister was born______the morning of March 12th,1990

应该填on

in表示较长时间，如世纪、朝代、时代、年、季节、月及一般（非特指）的早、中、晚等。

如 in the 20th century, in the 1950s, in 1989, in summer, in January, in the morning, in one’s life , in one’s thirties等。

on表示具体某一天及其早、中、晚。

如on May 1st, on Monday, on New Year’s Day, on a cold night in January, on a fine morning, on Sunday afternoon等。

at表示某一时刻或较短暂的时间，或泛指圣诞节，复活节等。

如at 3:20, at this time of year, at the beginning of, at the end of …, at the age of …, at Christmas， at night, at noon, at this moment等。

注意：在last, next, this, that, some, every 等词之前一律不用介词。如：We meet every day.

一段时间 月 日 年 都有用什么介词