2020
First observance
National Pet Carbon Monoxide (CO) Safety Day
Kidde’s launch announcement expressly calls September 17, 2020 the first National Pet Carbon Monoxide (CO) Safety Day.
Evergreen date guide
What is celebrated on September 17?
See the observances and verified observance-history milestones attached to September 17. Each observance keeps its own source and date details.
Verified history
Today in history →On this date in observance history
Selected observance milestones connected to this date, based on reviewed sources.
2012
Institutional decision
Global Day of Parents
UN Digital Library records A/RES/66/292 as adopted at the 130th plenary meeting on 17 September 2012.
2012
Institutional decision
National Psychotherapy Day
The launch announcement is dated September 17, 2012.
2003
First observance
AKC Responsible Dog Ownership Day
AKC’s launch materials explicitly describe the 17 September 2003 event as being held for the first time.
Curated global anchors
See the collection →Major global guides on September 17
A reviewed starting point drawn from prominent global observances with strong institutional or organizer sources. Each observance keeps its own documented status and scope.
Source-backedFixed AnnualIn-depth guide
World Patient Safety Day
WHO observance
Reviewed depth
Other in-depth guides on September 17
Source-backedFixed AnnualIn-depth guide
AKC Responsible Dog Ownership Day
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 AnnualIn-depth guide
Australian Citizenship Day
The Australian Department of Home Affairs states that Australian Citizenship Day is celebrated every year on September 17, was established by the Australian Government and first celebrated…
Source-backedFixed AnnualIn-depth guide
Constitution Day and Citizenship Day
36 U.S.C. §106 designates September 17 as Constitution Day and Citizenship Day and states that it commemorates the Constitution’s signing on September 17, 1787 and recognizes citizens. Publ…
Source-backedFixed AnnualIn-depth guide
International Country Music Day
The original International Country Music Day organizer record states that the Country Music Association of Spain created the observance in 2003 and holds it every September 17 to commemorat…
Source-backedFixed AnnualIn-depth guide
National DEI Day
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 AnnualIn-depth guide
National Pawpaw Day
Kentucky State University documents the inaugural National Pawpaw Day on 19 September 2019 and establishes the third Thursday of each September for pawpaw awareness.
Explore the mix
All topics →Topics represented on September 17
10 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
AKC Responsible Dog Ownership Day
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 AnnualIn-depth guide
Australian Citizenship Day
The Australian Department of Home Affairs states that Australian Citizenship Day is celebrated every year on September 17, was established by the Australian Government and first celebrated…
Source-backedFixed AnnualIn-depth guide
Constitution Day and Citizenship Day
36 U.S.C. §106 designates September 17 as Constitution Day and Citizenship Day and states that it commemorates the Constitution’s signing on September 17, 1787 and recognizes citizens. Publ…
Source-backedFixed AnnualIn-depth guide
International Country Music Day
The original International Country Music Day organizer record states that the Country Music Association of Spain created the observance in 2003 and holds it every September 17 to commemorat…
Source-backedFixed AnnualIn-depth guide
National DEI Day
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 AnnualIn-depth guide
National Pawpaw Day
Kentucky State University documents the inaugural National Pawpaw Day on 19 September 2019 and establishes the third Thursday of each September for pawpaw awareness.
Source-backedFixed AnnualIn-depth guide
National Pet Bird Day
BEAK/myBird states that BEAK created National Pet Bird Day in 2019 and that it takes place September 17 each year; avian-veterinary material supports responsible-ownership boundaries.
Source-backedFixed AnnualIn-depth guide
National Pet Carbon Monoxide (CO) Safety Day
Kidde’s September 17, 2020 launch announcement identifies that date as the first National Pet Carbon Monoxide (CO) Safety Day and frames it as a people-and-pets CO prevention and alarm-awar…
Source-backedFixed AnnualIn-depth guide
National Professional House Cleaners Day
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
WHO observance
How dates are selected
This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.
Read the methodology →