Refers specifically to December 31st, the last day of the year in Japan, often associated with traditions like eating toshikoshi soba and temple bell ringing.
On New Year's Eve, we eat toshikoshi soba with the family.
On New Year's Eve night, I went to listen to the temple bells ringing out the old year.
I ate toshikoshi soba on New Year's Eve.
On the night of New Year's Eve, people ring the temple bell.
I spent New Year's Eve quietly with my family.