# Days until Cinco de Mayo

Counts the days from today, or any date you choose, to the next Cinco de Mayo, with its date and day of the week.

- Page: https://www.acalculator.org/days/days-until-cinco-de-mayo
- JSON spec: https://www.acalculator.org/days/days-until-cinco-de-mayo.json
- Version: b62b2e83f36c

## Default answer

Example with the default inputs (Count from September 29, 2026) on the example date Tuesday, September 29, 2026: From September 29, 2026, there are 218 days until Cinco de Mayo on Wednesday, May 5, 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 Cinco de Mayo | Whole days from the start date to the next Cinco de Mayo; 0 on the day itself. |
| date | Date | The next date of Cinco de Mayo 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 date of Cinco de Mayo on or after the start date, then count the days from the start date to it.

## Assumptions

- Cinco de Mayo is May 5 every year.
- Start dates from January 1, 1900 to December 31, 2400 work, because the date field accepts that range.
- 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.

## Worked examples

1. from = 2026-01-01 gives date = 2026-05-05, days = 124. Source: the rule written again in Python 3 (datetime); docs/progress/WP-43.md.
2. from = 2026-05-06 gives date = 2027-05-05, days = 364. Source: the rule written again in Python 3 (datetime); docs/progress/WP-43.md.

## FAQ

### When is Cinco de Mayo 2027?

Cinco de Mayo 2027 is on Wednesday, May 5, 2027.

### When is Cinco de Mayo 2028?

Cinco de Mayo 2028 is on Friday, May 5, 2028.

### How is the date of Cinco de Mayo set?

Cinco de Mayo is May 5 every year. Source: the rule written again in Python 3 (datetime).

### How are the days until Cinco de Mayo counted?

From the start date (today, unless you change it) to the date, without counting the start date. The day before, the count is 1; on the day itself, it is 0; the day after, the count moves on to the next Cinco de Mayo.

## Sources

- the rule written again in Python 3 (datetime); docs/progress/WP-43.md