# Days until Friday

Counts the days from today, or any date you choose, to the next Friday, with its date and the Friday after it.

- Page: https://www.acalculator.org/days/days-until-friday
- JSON spec: https://www.acalculator.org/days/days-until-friday.json
- Version: 7ed27937c17c

## 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 2 days until Friday, October 2, 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 Friday | Whole days from the start date to the next Friday; 0 when the start date is a Friday. |
| date | Next Friday | The next Friday on or after the start date. |
| after | The Friday after | The Friday one week later. |

## Method

Days until Friday = (5 − the start date’s weekday + 7) mod 7, with Sunday = 0, Monday = 1, …, Saturday = 6.

## Assumptions

- On a Friday, the count is 0; the Friday after is 7 days away.
- The start date itself is not counted: from the day before, the count is 1.
- 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 = 2026-10-02, days = 4. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
2. from = 2026-12-31 gives date = 2027-01-01, days = 1. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
3. from = 2028-02-27 gives date = 2028-03-03, days = 5. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).

## FAQ

### How many days until Friday from each day of the week?

From Monday, 4; from Tuesday, 3; from Wednesday, 2; from Thursday, 1; from Friday, 0; from Saturday, 6; from Sunday, 5. On a Friday the count is 0, and the Friday after is 7 days away.

### What if today is Friday?

Then the count is 0, because the next Friday on or after today is today. The page also shows the Friday after it, 7 days later.

### How many Fridays are in a year?

A year of 365 days is 52 weeks and 1 day, so the weekday of January 1 comes 53 times and every other weekday 52 times; in a leap year, the weekdays of January 1 and 2 come 53 times. 2026 has 52 Fridays, and 2027 has 53.

### How are the days until Friday counted?

From the start date (today, unless you change it) to the next Friday, without counting the start date, in calendar days. Weekends and holidays count like any other day.