New Year's Eve was a cultural event held on the last day of the year according to some Earth calendars; usually this was 31 December. The events held were often celebrations and parties centred around midnight when the final seconds of the year could be experienced and the beginning of the new year celebrated, usually with fireworks (TV: Doctor Who, Resolution) and alcohol, or sometimes a kiss. (TV: Resolution)
On New Year's Eve in 1999, Alex Hopkins killed all of the members of Torchwood Cardiff bar Jack Harkness. He called Yvonne Hartman and spoke to Jack before killing himself, (TV: Fragments, AUDIO: One Rule) earning himself a place on the Red List. (AUDIO: The Torchwood Archive)
When the Tenth Doctor visited Rose Tyler on New Year's Day 2005, shortly before his regeneration, Rose assumed that he had had too much to drink. (TV: The End of Time)
By the period of the Second Great and Bountiful Human Empire it was not a well-known holiday, as Sara Kingdom did not recognise it. (TV: The Daleks' Master Plan)
Team TARDIS visited over nineteen New Year's Eves in a row, with each member having a favourite out of their trips. (TV: Resolution)
According to the Thirteenth Doctor, the first New Year's Eve celebrations took place in Mesopotamia, on land which would later become Iraq. Graham O'Brien later expressed was this was favourite of the nineteen New Year's Eves they had visited. (TV: Resolution)