# Days until December 1

Counts the days from today, or any date you choose, to the next December 1, with its day of the week.

- Page: https://www.acalculator.org/days/days-until-december-1
- JSON spec: https://www.acalculator.org/days/days-until-december-1.json
- Version: ccc3242d802b

## Default answer

Example with the default inputs (Count from September 30, 2026) on the example date Wednesday, September 30, 2026: From September 30, 2026, there are 62 days until December 1 on Tuesday, December 1, 2026.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| from | Count from | The date to count from. Today, unless you change it. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| days | Days until December 1 | Whole days from the start date to the next December 1; 0 on the day itself. |
| date | Date | The next December 1 on or after the start date. |
| weekday | Day of the week | The weekday of that date. |
| weeks | In weeks | The same number of days in weeks and days. |

## Method

Find the first December 1 on or after the start date, then count the days from the start date to it.

## Assumptions

- December 1 comes every year, so the count is never more than 365 days.
- The start date itself is not counted: from the day before December 1, the count is 1; on December 1 itself, it is 0.
- Start dates from January 1, 1900 to December 31, 2400 work for the count to December 1, the range the date field accepts.
- Today is the date on your own device, so the count to December 1 changes at midnight where you are. Dates are whole calendar days, so a daylight-saving change never adds or loses a day.

## Worked examples

1. from = 2027-12-01 gives date = 2027-12-01, days = 0. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
2. from = 2027-01-01 gives date = 2027-12-01, days = 334. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
3. from = 2027-12-02 gives date = 2028-12-01, days = 365. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).

## FAQ

### What day of the week is December 1?

Tuesday, December 1, 2026; Wednesday, December 1, 2027; Friday, December 1, 2028. The weekday of December 1 moves on one day a year, or two when a February 29 falls between.

### What day of the year is December 1?

December 1 is day 335 of a common year and day 336 of a leap year, such as 2028. Either way, 30 days of the year come after it.

### What season is December 1 in?

In the Northern Hemisphere, December 1 is in fall in every year from 2026 to 2035; in the Southern Hemisphere, it is spring. Seasons here start on the astronomical equinoxes and solstices, dated in US Eastern Time.

### Is December 1 a US federal holiday?

No. No US federal holiday falls on December 1. The next one in the calendar after December 1 is Christmas Day, which falls on December 25.

### How are the days until December 1 counted?

From the start date to December 1, without counting the start date: from November 30 the count is 1, and on December 1 it is 0. The day after, it moves on to the next December 1: from December 2, 2026, that is December 1, 2027, 364 days away.

## Sources

- 5 U.S.C. 6103 (federal holidays; weekend rule in 6103(b) and Executive Order 11582). Checked against OPM holiday schedules.
- Equinoxes and solstices: Jean Meeus, Astronomical Algorithms (2nd ed., 1998), chapter 27, checked against the US Naval Observatory.