The day that people realize that all the drinking and partying they did the night prior to (as in New Year's Eve) was worthless, because, in reality, it means nothing. The day of New Year's Eve is exactly the same as New Year's Day. It is also often used for people living crap lives to say all the things they are going to do "this new year", none of which they really will do, that end up being almost identical to last year's.
The only true difference between New Year's Day and the day of New Year's Eve, is that when writing the date, you must change one, or more (depending on what year it changed to) digits in the year category. When in school this becomes a nuisance when teachers deduct points due to writing the wrong date.
Before New Year's Day: "Dude I can't wait for New Year's, but for now, let's just get shit-faced!"

On New Year's Day: "Today is just like yesterday, except it's four degrees colder, and my head hurts like a bitch."
by Stevo-K December 31, 2009
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The day where peoples' promises to start living a better life kick off... while having a massive fucking hangover.
New Year's Eve: My New Years resolution is to eat healthier and excersize every day... What are these, Jell-O shots? Don't mind if I do!

New Year's Day: Fuck this headache. Let go to Waffle House.
by rogerthewhale January 1, 2014
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1. the first day of a new calendar year.

2. a hit from the legendary Irish rock band U2. It's from their classic 1983 album "War". This song catapulted U2 into world-wide stardom and they go on to become one of the greatest, important and influential rock'n'roll bands of all time.
1. at midnight, when New Year's Eve switched to New Year's Day me and Erika embraced each other and kicked off the new year with a passionate kiss.

2. some radio stations still start New Year's Day with a broadcast of "Auld Lang Syne", often the version by Guy Lombardo. A radio station in my home city once played "Nineteen Hundred Eighty-Five" by Sir Paul McCartney to celebrate the new year which happened to be...

3. many radio stations now start a new year by playing "New year's Day" by U2.

4. ..."nothing changes on new year's Day..." - U2

5. I've seen U2 live in concert twice so far. Check them out, they are one of the greatest live bands in the Universe and that's the truth.
by I Saw U2 Live Twice January 1, 2012
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first official day of the new year.

usually this day consist of being hungover.
"dude, how's your new years day going so far?"

"man sally and i got ridiculously wasted last night, i'm so hungover right now."
by jalexa December 28, 2009
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New Year's Day is also reffered to as National Hangover Day because of the fact that everyone and their mother is hungover from the previous night's debauchery.
by skankyhoe January 1, 2005
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The day your calendar in your room or where ever you keep it becomes useless.
Shit... It's new year's day. Now I gotta get me a new calendar for the new year.
by Longjohns January 1, 2006
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