the best day in my life VS the best day of my life Hello ! I'm here to ask about the thing that I mentioned above. I have studied some movies now, but one of my teacher said "the best day of my life" even though it sound like "the best day in my life" , the reason she said that like this "the best day of my life" is correct in grammar. so, I wondered that " the best day in my life" is incorrect? and if there's no error in this, can I use both of them for same situation ? Thank you in advance!