# Days until September

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

- Page: https://www.acalculator.org/days/days-until-september
- JSON spec: https://www.acalculator.org/days/days-until-september.json
- Version: fa5c37a6ec80

## 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 336 days until September on Wednesday, September 1, 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 September | Whole days from the start date to the next September 1; 0 on September 1 itself. |
| date | Date | The next September 1 on or after the start date. |
| weekday | Day of the week | The weekday of that September 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 September 1 on or after the start date, then count the days from the start date to it.

## Assumptions

- The count is to September 1, the first day of the month. During September, it counts to September 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 = 2027-09-01, days = 338, weekday = Wednesday. Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years).
2. from = 2026-09-01 gives date = 2026-09-01, 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 = 2026-09-02 gives date = 2027-09-01, 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 = 2028-09-01, days = 185, 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 September 2027 start?

September 2027 starts on Wednesday, September 1, 2027 and ends on Thursday, September 30, 2027.

### How many days are in September?

September always has 30 days, so September 2027 runs from Wednesday, September 1, 2027 to Thursday, September 30, 2027.

### What day of the week does September 2028 start on?

September 2028 starts on a Friday: Friday, September 1, 2028.

### What if it is already September?

The page counts to the first day of the month. On September 1 the count is 0; from September 2 to September 30 it counts to September 1 of the next year. From Thursday, September 2, 2027, that is Friday, September 1, 2028.

### How are the days until September counted?

From the start date (today, unless you change it) to September 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.