September 3 was the day which I was born.
September 3 was the day which I was born on.
September 3 was the day on which I was born.
Are all of these correct?
Do we have to use the preposition "on"?
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.Sign up to join this community
You do need to use “on”. Sentence 1 is no good; the other two are ok. The following sounds better, though:
I was born on September 3.
In any case, you need “on” to precede any specific date.