This is our day guide for Thursday September 17th 2026 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 2026
Angola: National Heroes' Day
Marks the birthday of the national hero Agostinho Netowho was born on this day in 1922.Regional
Bhutan (regional): Thimphu Drubchen
Celebrated three days before Thimphu Tshechu, this festival dates back to the early 18th century.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 1985
Vatican City: St Robert Bellarmine's Day
A public holiday is observed to mark the current pope's name day.Observances on September 17th 2026
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.
USA: National DEI Day
Celebrate National DEI Day by embracing diversity, equity, and inclusion. Join in meaningful conversations to build a more united and equitable society.September 16th 2026 | Go to Today | September 18th 2026
| Choose a Day |
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| General Information for September 17th 2026 | |
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| There are 5 public holidays today. | |
| Day 260 of 2026 | |
| 105 days left in 2026 | |
| Week 38 of the year | |
| On this Day in History | |
| 1980 - After weeks of strikes at the Lenin Shipyard in Gdansk, Poland, the nationwide independent trade union Solidarity is established. | |
| 1630 - The city of Boston, Massachusetts is founded. | |
| 1629 - The rescue of the Batavia by the Sardam coincides with the defeat of the mutineers in the Dutch East Indies. | |
| 1462 - The Battle of Swiecino (also known as the Battle of Zarnowiec) is fought during Thirteen 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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