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Evergreen date guide

What is celebrated on September 17?

For 2026, these source-backed observances resolve to Thursday, September 17. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

12 unique authority records

The list is deduplicated at the public entity layer while retaining all research provenance behind each page.

0 stable or rule-calculated

0 fixed annual and 0 reusable rule-based records can be placed without inventing a new date.

0 edition-specific

Edition-specific dates appear only when the requested year matches the verified edition; variable and historical records remain gated.

4 explicit country-scope records

Country scope stays attached to the underlying record instead of being generalized into a worldwide observance.

1 reviewed in-depth guides

These entities add reviewed meaning, history, activities, facts and FAQs without rewriting the authority facts.

Curated global anchors

Major global guides on September 17

See the collection →

A reviewed starting point drawn from prominent global observances with strong institutional or organizer provenance. Selection does not change each record’s official status or scope.

Source-backedFixed AnnualIn-depth guide

World Patient Safety Day

17 September · World Health Organization global health observance

WHO observance

Explore the mix

Topics represented on September 17

All topics →
Animals, Nature & Environment 2Community, Causes & Advocacy 2Celebrations & Social 2Health, Wellness & Awareness 2Civic, Remembrance & History 1Arts, Entertainment & Lifestyle 1Food, Drink & Hospitality 1Workplace, Professions & Appreciation 1
12 date-resolved records

All observances on this date

Source-backedFixed Annual

AKC Responsible Dog Ownership Day

17 September annually · American Kennel Club / responsible dog ownership campaign

The American Kennel Club designated September 17, the anniversary of the AKC’s founding, as AKC Responsible Dog Ownership Day and continues to publish the observance through its Responsible…

Source-backedFixed Annual

Australian Citizenship Day

17 September each year · Australian national citizenship observance

Australian Department of Home Affairs

Source-backedFixed Annual

Constitution Day and Citizenship Day

17 September · United States

The U.S. Courts’ official educational observance page identifies Constitution Day and Citizenship Day around 17 September, the anniversary of the Constitution’s signing.

Source-backedFixed Annual

International Country Music Day

17 September · International / informal country-music appreciation observance

Timeanddate identifies September 17 as International Country Music Day and treats it as an unofficial observance.

Source-backedFixed Annual

National Apple Dumpling Day

17 September · Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Apple Dumpling Day on 17 September.

Source-backedFixed Annual

National DEI Day

17 September · United States / National DEI Day organizer-led observance

The National DEI Day organizer site states that the observance is held each year on September 17, deliberately coinciding with U.S. Constitution Day and Citizenship Day.

Source-backedRule Based Annual

National Pawpaw Day

Third Thursday of September; 17 September in 2026 · Kentucky State University agriculture and native-fruit awareness observance

Kentucky State University documents National Pawpaw Day as the third Thursday of each September, created to increase awareness of the native pawpaw fruit.

Source-backedFixed Annual

National Pet Bird Day

17 September · United States-origin / Bird Enjoyment & Advantage Koalition companion-bird campaign

The Bird Enjoyment & Advantage Koalition states that it created National Pet Bird Day in 2019 and that the observance takes place on September 17 each year.

Source-backedFixed Annual

National Pet Carbon Monoxide (CO) Safety Day

17 September · United States and Canada / Kidde-origin pet carbon-monoxide safety campaign

Kidde’s campaign announcement identifies September 17 as National Pet Carbon Monoxide Awareness/Safety Day and ties the observance to pet-owner carbon-monoxide education.

Source-backedFixed Annual

National Professional House Cleaners Day

17 September · United States / American House Cleaners Association-founded professional recognition

National Day Calendar records the American House Cleaners Association as founder and September 17 as the annual observance date.

Source-backedFixed AnnualIn-depth guide

World Patient Safety Day

17 September · World Health Organization global health observance

WHO observance

Source-backedEdition Specific

World Quantum Readiness Day

17 September 2026 for the third annual edition · DigiCert-organized global virtual cybersecurity and post-quantum-readiness event

DigiCert’s current event page and August 2026 announcement identify the third annual World Quantum Readiness Day on 17 September 2026.

How this date is built

This page is assembled from verified fixed dates, reusable recurrence rules, and target-year records whose edition matches 2026. Variable, historical or unresolved records are not silently forced onto this date.

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