Days until September 23
September 23 falls on a Wednesday in 2026 and a Thursday in 2027. The count runs from today’s date on your device to the next September 23; pick another date to count from it instead.
- Days until September 23
- 358
From September 30, 2026, there are 358 days until September 23 on Thursday, September 23, 2027.
- Date
- Thursday, September 23, 2027
- Day of the week
- Thursday
- In weeks
- 51 weeks and 1 day
Answer for the example date Wednesday, September 30, 2026. It changes to today's date when the page loads.
Days until September 23: 358. From September 30, 2026, there are 358 days until September 23 on Thursday, September 23, 2027.
Where is September 23 on the calendar?
How to calculate
Counts the days from today, or any date you choose, to the next September 23, with its day of the week.
Example with the default inputs (Count from September 30, 2026) on the example date Wednesday, September 30, 2026: From September 30, 2026, there are 358 days until September 23 on Thursday, September 23, 2027.
Method: Find the first September 23 on or after the start date, then count the days from the start date to it.
- September 23 comes every year, so the count is never more than 365 days.
- The start date itself is not counted: from the day before September 23, the count is 1; on September 23 itself, it is 0.
- Start dates from January 1, 1900 to December 31, 2400 work for the count to September 23, the range the date field accepts.
- Today is the date on your own device, so the count to September 23 changes at midnight where you are. Dates are whole calendar days, so a daylight-saving change never adds or loses a day.
Worked examples
Each example is checked against the calculator on every build.
- Count from 2027-09-23 gives Date 2027-09-23, Days until September 23 0.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
- Count from 2027-01-01 gives Date 2027-09-23, Days until September 23 265.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
- Count from 2027-09-24 gives Date 2028-09-23, Days until September 23 365.Source: U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years)
Other questions people ask
What day of the week is September 23?
Wednesday, September 23, 2026; Thursday, September 23, 2027; Saturday, September 23, 2028. The weekday of September 23 moves on one day a year, or two when a February 29 falls between.
What day of the year is September 23?
September 23 is day 266 of a common year and day 267 of a leap year, such as 2028. Either way, 99 days of the year come after it.
What season is September 23 in?
In the Northern Hemisphere, September 23 is in fall in 2026, 2028, 2029, 2030, 2032, 2033, and 2034 and the first day of fall (the September equinox) in 2027, 2031, and 2035, because the equinox or solstice moves by a day between years. Seasons here start on the astronomical equinoxes and solstices, dated in US Eastern Time.
Is September 23 a US federal holiday?
No. No US federal holiday falls on September 23. The next one in the calendar after September 23 is Columbus Day, which falls between October 8 and October 14.
How are the days until September 23 counted?
From the start date to September 23, without counting the start date: from September 22 the count is 1, and on September 23 it is 0. The day after, it moves on to the next September 23: from September 24, 2026, that is September 23, 2027, 364 days away.