Countdown
How many days until December 21?
100
days until December 21
The next December 21 is Monday, December 21, 2026
Counting down to December 21
There are 100 days until December 21. The next December 21 falls on Monday, December 21, 2026. This countdown updates automatically every day — bookmark it and check back any time.
The 100 days until December 21, broken down
70
business days
30
weekend days
14
full weeks
2
extra days
That's 70 working days (Monday to Friday) and 30 weekend days — 15 Saturdays and 15 Sundays. Public holidays vary by country, so they aren't deducted.
On December 21 in history
- 1898Pierre and Marie Curie announce the discovery of radium
- 1937Disney's Snow White premieres as first full-length animated feature
- 1968Apollo 8 launches, first crewed mission to orbit the Moon
- 1988Pan Am Flight 103 bombed over Lockerbie, killing 270
Notable world events that happened on December 21 in earlier years.
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