This is our day guide for Sunday September 21st 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?
Observances on September 21st 2025
World Alzheimer’s Day
2 out of every 3 people globally believe there is little or no understanding of dementia in their countries.
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National Gratitude Day 🙏
Celebrate World Gratitude Day by embracing thankfulness, enhancing well-being, and fostering global connections. Discover the power of gratitude today!
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International Day of Peace
The International Day of Peace is celebrated annually on 21 September and is a United Nations-commissioned global holiday.
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Public Holidays on September 21st 2025
Swiss Federal Fast
A Swiss government-arranged multi-denominational holiday celebrated by Christians and the Jewish community
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