What Day: December 31
Find the day of the week for any date of the year.
December 31 this year (2026) falls on a Thursday. It's day 365 of the year, with 0 days left afterward, sits in Q4 (Winter), and falls under the zodiac sign Capricorn in Western astrology. Because of how leap years shift the calendar, a date's day-of-week doesn't repeat on a fixed yearly schedule. December 31 will next fall on a Thursday again in 2037. Within December, this is day 31 of 31, roughly 100% through the month. Overall, that's roughly 100% of the way through the year.
As of October 1, 2026, 12:19 PM (America/New York).
A Decade Ago
December 31, 2016 fell on a Saturday, a useful reference point if you're comparing how a recurring event has shifted across the week over the years.
Half a Year Away
Roughly six months from December 31 is June 28, which falls in summer and lands on a Sunday this year.
Nearby Dates
Check the day of the week for the date just before or after December 31 using the links below.