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  1. September 3 was the day which I was born.

  2. September 3 was the day which I was born on.

  3. September 3 was the day on which I was born.

Are all of these correct?

Do we have to use the preposition "on"?

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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.

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