Days until December 31
December 31 falls on a Thursday in 2026 and a Friday in 2027. The count runs from today’s date on your device to the next December 31; pick another date to count from it instead.
- Days until December 31
- 92
From September 30, 2026, there are 92 days until December 31 on Thursday, December 31, 2026.
- Date
- Thursday, December 31, 2026
- Day of the week
- Thursday
- In weeks
- 13 weeks and 1 day
Answer for the example date Wednesday, September 30, 2026. It changes to today's date when the page loads.
Days until December 31: 92. From September 30, 2026, there are 92 days until December 31 on Thursday, December 31, 2026.
Where is December 31 on the calendar?
How to calculate
Counts the days from today, or any date you choose, to the next December 31, with its day of the week.
Example with the default inputs (Count from September 30, 2026) on the example date Wednesday, September 30, 2026: From September 30, 2026, there are 92 days until December 31 on Thursday, December 31, 2026.
Method: Find the first December 31 on or after the start date, then count the days from the start date to it.
- December 31 comes every year, so the count is never more than 365 days.
- The start date itself is not counted: from the day before December 31, the count is 1; on December 31 itself, it is 0.
- Start dates from January 1, 1900 to December 31, 2400 work for the count to December 31, the range the date field accepts.
- Today is the date on your own device, so the count to December 31 changes at midnight where you are. Dates are whole calendar days, so a daylight-saving change never adds or loses a day.
Worked examples
Each example is checked against the calculator on every build.
- Count from 2027-12-31 gives Date 2027-12-31, Days until December 31 0.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
- Count from 2027-01-01 gives Date 2027-12-31, Days until December 31 364.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
- Count from 2028-01-01 gives Date 2028-12-31, Days until December 31 365.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
Other questions people ask
What day of the week is December 31?
Thursday, December 31, 2026; Friday, December 31, 2027; Sunday, December 31, 2028. The weekday of December 31 moves on one day a year, or two when a February 29 falls between.
What day of the year is December 31?
December 31 is the last day of the year: day 365 of a common year and day 366 of a leap year, such as 2028.
What season is December 31 in?
In the Northern Hemisphere, December 31 is in winter in every year from 2026 to 2035; in the Southern Hemisphere, it is summer. Seasons here start on the astronomical equinoxes and solstices, dated in US Eastern Time.
Is December 31 a US federal holiday?
In some years. December 31 is the federal day off for New Year's Day when January 1 falls on a Saturday, as on Friday, December 31, 2027.
How are the days until December 31 counted?
From the start date to December 31, without counting the start date: from December 30 the count is 1, and on December 31 it is 0. The day after, it moves on to the next December 31: from January 1, 2027, that is December 31, 2027, 364 days away.