Day Guide for Thursday September 18th 2025 What are the holidays on September 18th 2025?

This is our day guide for Thursday September 18th 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 18th 2025

Not a Public Holiday

Armenia: Exaltation of the Holy Cross

Celebrates the return of the Holy Cross to Jerusalem following its capture by the Persians

Chile: Independence Day

On September 18th 1810, Chile broke from Spanish rule, declaring their independence. The Spanish had ruled Chile since the middle of the Sixteenth Century

Observances on September 18th 2025

USA: National Cheeseburger Day

Some of the observances and national days on this site are cheesy.

USA: National HIV/AIDS and Aging Awareness Day

This day brings attention to the growing number of people living long and full lives with HIV and to their health and social needs.

International: World Bamboo Day

Discover the eco-friendly beauty of bamboo on World Bamboo Day - September 18th! Explore sustainable uses, cultivation, and its positive impact on the environment.

United Nations: International Equal Pay Day

Discover International Equal Pay Day, observed on September 18th. Learn about the history and importance of the gender pay gap and how to advocate for equal pay in your community.

September 17th 2025 | Go to Today | September 19th 2025

Choose a Day
General Information for September 18th 2025
There are 2 public holidays today.
Day 261 of 2025
104 days left in 2025
Week 38 of the year
On this Day in History
1990 - Liechtenstein becomes a member of the United Nations.
1851 - First publication of The New-York Daily Times, which later becomes The New York Times.
1679 - New Hampshire becomes a county of the Massachusetts Bay Colony.
1180 - Manuel I Komnenos, last Emperor of the Komnenian restoration dies. The Byzantine Empire slips into terminal decline.