# Days until April 21

Counts the days from today, or any date you choose, to the next April 21, with its day of the week.

- Page: https://www.acalculator.org/days/days-until-april-21
- JSON spec: https://www.acalculator.org/days/days-until-april-21.json
- Version: 1e2cd6ec9ae6

## 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 203 days until April 21 on Wednesday, April 21, 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 21 | Whole days from the start date to the next April 21; 0 on the day itself. |
| date | Date | The next April 21 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 21 on or after the start date, then count the days from the start date to it.

## Assumptions

- April 21 comes every year, so the count is never more than 365 days.
- The start date itself is not counted: from the day before April 21, the count is 1; on April 21 itself, it is 0.
- Start dates from January 1, 1900 to December 31, 2400 work for the count to April 21, the range the date field accepts.
- Today is the date on your own device, so the count to April 21 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 = 2027-04-21 gives date = 2027-04-21, 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 = 2027-04-21, days = 110. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
3. from = 2027-04-22 gives date = 2028-04-21, 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 21?

Tuesday, April 21, 2026; Wednesday, April 21, 2027; Friday, April 21, 2028. The weekday of April 21 moves on one day a year, or two when a February 29 falls between.

### What day of the year is April 21?

April 21 is day 111 of a common year and day 112 of a leap year, such as 2028. Either way, 254 days of the year come after it.

### What season is April 21 in?

In the Northern Hemisphere, April 21 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 21 a US federal holiday?

No. No US federal holiday falls on April 21. The next one in the calendar after April 21 is Memorial Day, which falls between May 25 and May 31.

### How are the days until April 21 counted?

From the start date to April 21, without counting the start date: from April 20 the count is 1, and on April 21 it is 0. The day after, it moves on to the next April 21: from April 22, 2026, that is April 21, 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.