# Days until April 17

Counts the days from today, or any date you choose, to the next April 17, with its day of the week.

- Page: https://www.acalculator.org/days/days-until-april-17
- JSON spec: https://www.acalculator.org/days/days-until-april-17.json
- Version: 9c64c06e2a51

## 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 199 days until April 17 on Saturday, April 17, 2027.

## Inputs

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

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| days | Days until April 17 | Whole days from the start date to the next April 17; 0 on the day itself. |
| date | Date | The next April 17 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 April 17 on or after the start date, then count the days from the start date to it.

## Assumptions

- April 17 comes every year, so the count is never more than 365 days.
- The start date itself is not counted: from the day before April 17, the count is 1; on April 17 itself, it is 0.
- Start dates from January 1, 1900 to December 31, 2400 work for the count to April 17, the range the date field accepts.
- Today is the date on your own device, so the count to April 17 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 = 2027-04-17 gives date = 2027-04-17, 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 = 2027-04-17, days = 106. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
3. from = 2027-04-18 gives date = 2028-04-17, 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 April 17?

Friday, April 17, 2026; Saturday, April 17, 2027; Monday, April 17, 2028. The weekday of April 17 moves on one day a year, or two when a February 29 falls between.

### What day of the year is April 17?

April 17 is day 107 of a common year and day 108 of a leap year, such as 2028. Either way, 258 days of the year come after it.

### What season is April 17 in?

In the Northern Hemisphere, April 17 is in spring in every year from 2026 to 2035; in the Southern Hemisphere, it is autumn. Seasons here start on the astronomical equinoxes and solstices, dated in US Eastern Time.

### Is April 17 a US federal holiday?

No. No US federal holiday falls on April 17. The next one in the calendar after April 17 is Memorial Day, which falls between May 25 and May 31.

### How are the days until April 17 counted?

From the start date to April 17, without counting the start date: from April 16 the count is 1, and on April 17 it is 0. The day after, it moves on to the next April 17: from April 18, 2026, that is April 17, 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.