How long until September 23?
It is 17 days, 3 hours, 39 minutes, 53 seconds until September 23, 2026.
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Temporal Context & Calendar Metrics for September 23
Excludes 5 weekend days (Saturdays & Sundays).
72.9% of annual orbital cycle.
Autumnal Equinox occurred September 22
Air element (Sep 23 - Oct 22).
About September 23: Significance & History
Calendar Significance & Context
International Day of Sign LanguagesSeptember 23 marks the 266th day of the year (267th in leap years) within the third quarter. Historically, key milestones on this date include the events of 1846 (Astronomer Johann Gottfried Galle discovers the planet Neptune at the Berlin Observatory) and 1889 (Fusajiro Yamauchi founds Nintendo in Kyoto, Japan, as a playing card manufacturing company). Notable figures born on this day include Augustus Caesar (born 63 BC) and John Coltrane (born 1926). The date also observes International Day of Sign Languages.
On This Day in History
- 1846
Astronomer Johann Gottfried Galle discovers the planet Neptune at the Berlin Observatory.
- 1889
Fusajiro Yamauchi founds Nintendo in Kyoto, Japan, as a playing card manufacturing company.
- 1932
The Kingdom of Hejaz and Nejd is unified to form the Kingdom of Saudi Arabia under King Ibn Saud.
Notable Birthdays
- Augustus Caesarb. 63 BC
First Emperor of the Roman Empire who initiated the Pax Romana.
- John Coltraneb. 1926
American jazz saxophonist and composer who pioneered modal and free jazz.
- Bruce Springsteenb. 1949
American singer-songwriter and rock musician known as 'The Boss'.
Explore Related Calendar Dates
Adjacent Calendar Days:
Day 23 Across All Months:
Frequently Asked Questions About September 23
How do I set an alarm chime for when September 23 arrives?
Click "Set Alarm" on the action toolbelt. When the live chronometer reaches 00:00:00 (midnight of September 23), an audio harmonic chime will ring in real-time.
Can I keep my screen awake while watching the countdown to September 23?
Yes. Click the "Keep Awake" button on the chronometer toolbelt to activate the Screen Wake Lock API in supported browsers, preventing your device screen from sleeping.
Which astronomical season and quarter does September 23 belong to?
September 23 falls in the astronomical season of Autumn within Q3 of the calendar year. (Autumnal Equinox occurred September 22).
How many weeks and weekend days are left until September 23?
There are 2 full weeks plus 3 days (5 total weekend Saturdays and Sundays) remaining until September 23.