How many days until December 31?
100 days
December 31 next falls on Thursday, December 31, 2026. Counted from today, Tuesday, September 22, 2026, US Eastern Time.
- Falls on a
- Thursday
- In weeks
- 14 weeks
- ISO week
- Week 53
- Weekend?
- No, a weekday
December 31 in the years ahead
| Year | Date | Days away |
|---|---|---|
| 2026 | Thursday | 100 |
| 2027 | Friday | 465 |
| 2028 | Sunday | 831 |
| 2029 | Monday | 1,196 |
| 2030 | Tuesday | 1,561 |
| 2031 | Wednesday | 1,926 |
December 2026
| ISO week | Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|---|
| 49 | |||||||
| 50 | |||||||
| 51 | |||||||
| 52 | |||||||
| 53 | 100 days |
About the countdown to December 31
There are 100 days between today and December 31, which next falls on Thursday, December 31, 2026 — the 31st day of December and the 365th day of 2026. That is 14 full weeks and 2 days.
December 31 falls on a Thursday in 2026. Because a common year is 365 days, or 52 weeks and one day, the weekday advances by one each year and by two across a leap year — so December 31 will be a Friday in 2027.
Other ways this is asked
- How many days till December 31?
- 100 days.
- How many more days until December 31?
- 100 days from today, Tuesday, September 22, 2026.
- What day of the week is December 31?
- Thursday, in 2026.
- How many weeks until December 31?
- 14 weeks and 2 days.