New Year’s Day is January 1st. New Year’s Eve is December 31th. Some people think that December 30th should be called “New Year’s Adam” because Adam came before Eve.
 
“New Year’s Adam” was entered in the Urban Dictionary on December 29, 2007.
 
“Christmas Adam” (December 23, the day before Christmas Eve) is a similar term.
 
     
Urban Dictionary
New Year’s Adam
The day before New Year’s Eve. Since Adam was created before Eve, and the need to be equitable in the new year’s season, New Year’s Adam creates further anticipation of New Years Day.
When is your family coming to our place?
On New Year’s Adam and leaving January 5th.
New Year’s Adam is the last chance to prepare for the New Year’s Eve party.
#new year’s#adam#eve#celebration#day#new years
by IshF December 29, 2007
     
Twitter 
John H
@marfotic
Today is New Year’s Adam. Followed by New Year’s Eve. 😊
8:48 AM · Dec 30, 2009·Twitter SMS
   
Twitter
David Tilley
@B1B_Lancer
Could the day before New Year’s Eve be called New Year’s Adam?  Just wondering.
9:36 AM · Dec 30, 2009·Twitter SMS
   
Twitter
Jenna Ingham 🧜‍♀️👖
@heymissjenna
Happy New Year’s Adam, tweeps! (You know, the day before New Year’s Eve. AKA New Year’s Eve Eve.)
7:57 AM · Dec 30, 2010·Twitter for iPad
 
Twitter
Ash Poulard
@blu_ashes
How come there’s no name for the day before an Eve??.. like.. New Year’s Adam for December 30th….. am I right?? ::waits for agreement::
1:04 AM · Dec 25, 2012·Twitter for Android
 
Twitter
Malik
@Alaskan_Summer
Tomorrow (December 30th) will be considered New Year’s Adam. Because Adam was created before Eve, and the same also went for Christmas Adam.
5:46 AM · Dec 29, 2016·Twitter for Android
     
Star-Telegram (Fort Worth, TX)
Where to dine out (and get your black-eyed pea fix) in DFW on NYE and New Year’s Day.
BY ROBERT PHILPOT
DECEMBER 20, 2018 10:58 AM
(...)
Taco y Vino will host a “New Year’s Adam Tasting Menu Takeover” on Dec. 30 (the day before New Year’s Eve, because Adam preceded Eve, right?). Chef Lance McWhorter of ETX Provisions and Graham Shockley of Oak Cliff restaurant Nova will serve an eight-course meal paired with sparkling wines. The menu is subject to change, but we’re intrigued by such entries as “Serpent’s Apple” with toasted hazelnut and French radish over Profound Microfarms greens. For the full menu, go to the Facebook Events page. $140 per person; email .(JavaScript must be enabled to view this email address) for reservations. 213 W. 8th St., Dallas, 469-372-0022, @TacoyVinoDallas on Facebook
   
Google Books
Super-Funny ROFL Jokes:
More Than 444 Jokes for Kids
Nashville, TN: Thomas Nelson
2019
Pg. 57:
Q: What did Adam say on December 31st?
A: “It is New Year’s, Eve!”
 
Q: What comes before New Year’s Eve?
A: New Year’s Adam.
 
Twitter
🤣 The Dad Joke Man 😉
@DadJokeMan
Is there a ‘New Years Adam’ as well? #StupidNYEQuestions
5:06 PM · Dec 31, 2019·Twitter for iPhone