December 31
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| December 31 in recent years |
| 2024 (Tuesday) |
| 2023 (Sunday) |
| 2022 (Saturday) |
| 2021 (Friday) |
| 2020 (Thursday) |
| 2019 (Tuesday) |
| 2018 (Monday) |
| 2017 (Sunday) |
| 2016 (Saturday) |
| 2015 (Thursday) |
December 31 is the 365th day of the year (366th in leap years) in the Gregorian calendar. It is known by a collection of names including: Saint Sylvester's Day, New Year's Eve or Old Year's Day/Night, as the following day is New Year's Day. It is the last day of the year; the following day is January 1, the first day of the following year.