Day Guide for Wednesday September 17th 2025 What are the holidays on September 17th 2025?

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

India (regional): Viswakarma Puja

Vishwakarma Puja is a day of celebration for Vishwakarma, a Hindu god, the divine architect

Nepal: Nepal National Mourning Day

A national mourning day to pay tribute to those killed in the violent anti-government agitation.

Papua New Guinea: Independence Day Holiday

Commemorates the day Papua New Guinea gained its indepence from Australia in 1975

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

Observances 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.

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.

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General Information for September 17th 2025
There are 6 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.
1972 - The first episode of the M*A*S*H TV series is aired; the show is going to last 11 years - four years longer than the Korean War that had inspired it.
1916 - World War I: Manfred von Richthofen ("The Red Baron"), a flying ace of the German Luftstreitkräfte, wins his first aerial combat near Cambrai, France.
1908 - The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality.