This is our day guide for Wednesday September 17th 2025 which shows you at a glance what's happening on this day around the world. Using the calendar on this page, you can look at a day guide for any day. Why not look up your birthday to see which holidays you share it with?
Holidays on September 17th 2025
Angola: National Heroes' Day
Marks the birthday of the national hero Agostinho Netowho was born on this day in 1922.Regional
Spain (regional): Day of Melilla
Melilla only. Marks the taking of the city by Duke of Medina Sidonia in 1497
Tonga: Birthday of HRH Crown Prince
The current heir to the throne was born on September 17th 1985Observances on September 17th 2025
USA: Constitution Day and Citizenship Day
One of the most patriotic holidays, today celebrates both the constitution and citizens of the USA.
USA: National Apple Dumpling Day
Find out the dates, history and traditions of National Apple Dumpling Day
Honduras: Teachers Day
Find out the dates, history and traditions of Teachers Day
International: World Patient Safety Day
World Patient Safety Day was established to enhance global understanding of patient safety
Belarus: Day of People's Unity
Find out the dates, history and traditions of the Day of People's Unity in Belarus.September 16th 2025 | Go to Today | September 18th 2025
| Choose a Day |
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| General Information for September 17th 2025 | |
|---|---|
| There are 3 public holidays today. | |
| Day 260 of 2025 | |
| 105 days left in 2025 | |
| Week 38 of the year | |
| On this Day in History | |
| 1974 - Bangladesh, Grenada and Guinea-Bissau join the United Nations. | |
| 1908 - The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality. | |
| 1787 - Russians under Alexander Suvorov defeat the Turks at Kinburn. | |
| 1631 - Sweden wins a major victory at the Battle of Breitenfeld against the Holy Roman Empire during the Thirty Years' War. |
Office Holidays provides calendars with dates and information on public holidays and bank holidays in key countries around the world.
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