Learn English – New years eve 2018!

OK so yesterday was that time of year when it irritates me to see posters for "New Year's Eve 2018" events, and on TV "Rocking Eve' 2018". (Though granted the latter is a copyrighted name and can mean anything the originator wants it to mean.)

Surely yesterday was actually "New Years Eve 2017", and today is "New Year's Day 2018"

Or perhaps yesterday was "The eve of 2018"..

Isn't New Year's Eve 2018, like 364 days from today? That is, the day before New Years Day 2019.

SUPPORTING REFERENCES:

Wikepedia

In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December
…..
Many Christian congregations have New Year's Eve watchnight services…. Watch Night took on special significance to African Americans on New Year's Eve 1862, as slaves anticipated the arrival of 1 January 1863, when Lincoln had announced he would sign the Emancipation Proclamation.

Oxford Dictionary and Every other dictionary I can Google.

New Year’s Eve (noun)
31 December, especially the evening of that day

Epcot

December 31, 1999
New Year's Eve 1999 was an eagerly awaited day by many around the world…

TimeAndDate.Com

Quick Facts
New Year's Eve is the last day of the year and the day before New Year's Day. New Year's Eve in Canada always falls on December 31 according to the Gregorian calendar.
New Year's Eve 2018 : Monday, December 31, 2018
New Year's Eve 2019 : Tuesday, December 31, 2019

UPDATE:

I am of course willing to accept that I could be wrong here. It may be that I am missing some subtlety that I am overlooking, like perhaps what I am thinking of is "New Year's Ever, 2017" where the comma changes the meaning of the year number to more of a date than a numerical counter.

Anyway, I'm interesting in knowing the correct term and usage.