# Days until December

Counts the days from today, or any date you choose, to December 1, the first day of the next December, with its weekday and the time in weeks and months.

- Page: https://www.acalculator.org/days/days-until-december
- JSON spec: https://www.acalculator.org/days/days-until-december.json
- Version: ae731bc27824

## 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 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 | Whole days from the start date to the next December 1; 0 on December 1 itself. |
| date | Date | The next December 1 on or after the start date. |
| weekday | Day of the week | The weekday of that December 1. |
| weeks | In weeks | The same number of days in weeks and days. |
| months | In months and days | The time to that date in whole months, then days. |

## Method

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

## Assumptions

- The count is to December 1, the first day of the month. During December, it counts to December 1 of the next year.
- The start date itself is not counted: from the day before, the count is 1; on the day itself, it is 0.
- Dates are calendar days with no time of day, so a time zone or a daylight-saving change never adds or loses a day.
- Start dates from January 1, 1900 to December 31, 2400 work.

## Worked examples

1. from = 2026-09-28 gives date = 2026-12-01, days = 64, weekday = Tuesday. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
2. from = 2026-12-01 gives date = 2026-12-01, days = 0, weekday = Tuesday. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
3. from = 2026-12-02 gives date = 2027-12-01, days = 364, weekday = Wednesday. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
4. from = 2028-02-29 gives date = 2028-12-01, days = 276, weekday = Friday. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).

## FAQ

### When does December 2026 start?

December 2026 starts on Tuesday, December 1, 2026 and ends on Thursday, December 31, 2026.

### How many days are in December?

December always has 31 days, so December 2026 runs from Tuesday, December 1, 2026 to Thursday, December 31, 2026.

### What day of the week does December 2027 start on?

December 2027 starts on a Wednesday: Wednesday, December 1, 2027.

### What if it is already December?

The page counts to the first day of the month. On December 1 the count is 0; from December 2 to December 31 it counts to December 1 of the next year. From Wednesday, December 2, 2026, that is Wednesday, December 1, 2027.

### How are the days until December counted?

From the start date (today, unless you change it) to December 1, without counting the start date: from the last day of the month before, the count is 1. The weeks and months shown are the same span, in whole weeks and in whole months plus days.