Since you provided a time, I am taking a guess that it's online and the teacher or professor should usually give you a time that officially marks when it's due on January 3rd. If not, you could turn it in on January 3rd anytime, but not after 12:00 a.m. which would make it January 4th. I hope this makes since.
Simile to compare his hair to a mule's tail.
Second person is a point of view (how a story is told) where the narrator tells the story to another character using the word 'you. ' The author could be talking to the audience, which we could tell by the use of 'you,' 'you're,' and 'your.