New Year's Day was the celebration of the first day of the year, held on 1 January on most parts of Earth. (TV: Doctor Who, Resolution) It was preceded by New Year's Eve, the last day of the year, on 31 December. (TV: The End of Time)
According to Lin, most people were hung over on New Year's Day, recovering from New Year celebrations the night before; and there was nothing to do because everything was closed. Some people made resolutions to improve themselves. (TV: Resolution)