take NJ transit to penn station, then take sub to time square. You might need to get on airtrain at newark airport to get to the NJ transit station.
But the ride of airtrain is free.

take airtrain to newark train station, take NJ transit train from Newark to 33rd st penn station, and then either walk, or take subway.

如果太晚去time square也不太好吧。怕不那么安全，尤其地铁里。如果是1、2个女孩子，还是不要了。