YOU SAID:

I'm going to a party at 3 o'clock

INTO JAPANESE

３時にパーティーに行きます

BACK INTO ENGLISH

I'm going to the party at 3 o'clock

INTO JAPANESE

私は3時にパーティーに行きます

BACK INTO ENGLISH

I go to the party at 3 o'clock

INTO JAPANESE

私は3時にパーティーに行きます

BACK INTO ENGLISH

I go to the party at 3 o'clock