Consider the following examples:
- We are going to Japan on Wednesday.
- We are going to Japan Wednesday.
- We are going to Japan on tomorrow.
- We are going to Japan tomorrow.
My question is about 2 and 3. For 2 I hear it spoken all the time, but it seems a bit unusual as written words. As for 3, the "on" feels very much a redundant word in both written and spoken English.
Wish that somebody could tell me if 2 and 3 are ok in terms of both spoken and written styles.