How many days until December 21?

How the December 21 count works

Our counter counts the full days that begin tomorrow up to Monday, December 21, 2026. The day today is Thursday, November 5, 2026, and today is skipped, giving an answer of 46 days.

After December 21 has gone this year, the counter targets the next one. On December 21 itself it declares it is the date, and tomorrow it starts counting to the following year.

The week, month and work day counts rest on the same dates. A business day is any weekday from Monday to Friday, and the hours figure is taken from midnight today.

The number of hours begins at the midnight that starts today to the opening midnight of December 21. The sleeps figure is identical to the day count, because each night is a sleep.

Lots of people ask about the days left to December 21 for a move. The total shown updates daily.

Planning around December 21

Booking is easier after you learn its weekday. In 2026 the day is a Monday, and the row of years shows how that shifts year after year.

The 30 to 100 day table serves deadlines counted in set blocks. Notice periods, probation and payment terms regularly use those lengths, so the table gives dates on either side.

The dates around December 21 each have their own page. Hop to the day before or after and see how the count changes.

February 29 is added in a leap year. A countdown that crosses it picks up one more day, and the calendar logic takes care of it.

A date that is a weekend day may move business deadlines, since many firms and banks are closed on those days.

About the date

December 21 comes as the 355th day of 2026, with 10 days left after it. It is placed in Week 52 of 2026, under ISO rules, where weeks open on Monday.

The sign linked to December 21 is Sagittarius, and the birthstones for December are turquoise, tanzanite and zircon. These come from tradition rather than science, and sources can differ by a day on the dates.

When you are counting to a birthday, supply the year you were born in the box above. The box gives the age you reach on the next December 21.

Keep this page open and the count recounts in your own time zone, so it remains right when the clock passes midnight. Press share to send the countdown to someone else.

Dates, weekdays and the calendar

A calendar day arrives on a different weekday between one year and the next. A non leap year is 52 weeks and a day over, so the weekday jumps by one, or two after a leap year.

This is why the ten year table matters ahead of any booking. A day on a Saturday this year could fall on a Monday in two years, which changes the plan.