2024
First observance
National Parvo Awareness Day
Elanco’s launch release calls 23 April 2024 the first-ever National Parvo Awareness Day.
Evergreen date guide
What is celebrated on April 23?
See the observances and verified observance-history milestones attached to April 23. 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.
2018
Later action
Spanish Language Day
Moved the operational observance from the original October 12 date to April 23.
2012
Institutional decision
Commemoration of the abolition of slavery — Saint-Barthélemy
The amending decree is dated 23 April 2012.
2012
Institutional decision
Commemoration of the abolition of slavery — Saint-Martin
The amending decree is dated 23 April 2012.
2009
First observance
Talk Like Shakespeare Day
ABC7 Chicago’s April 23, 2010 coverage explicitly says the event started the previous year in Chicago, while contemporary 2009 coverage records the April 23, 2009 mayoral proclama…
1996
First observance
World Book and Copyright Day
The International Publishers Association records that World Book and Copyright Day was celebrated for the first time on 23 April 1996 during the 25th International Publishers Cong…
1908
Institutional decision
U.S. Army Reserve Birthday
Army Reserve official birthday 2026 marks 118 years since this date.
Curated global anchors
See the collection →Major global guides on April 23
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 Book and Copyright Day
UNESCO 28 C/Resolution 3.18
Reviewed depth
Other in-depth guides on April 23
Source-backedFixed AnnualIn-depth guide
Canada Book Day
Canadian House of Commons records identify April 23 Canada Book Day as a distinct Canadian observance, name Lawrence Martin as its brainchild and the Writers’ Trust of Canada as organizer,…
Source-backedFixed AnnualIn-depth guide
English Language Day
United Nations language observance
Source-backedRule Based AnnualIn-depth guide
International Girls In ICT Day
Source-backedFixed AnnualIn-depth guide
National English Muffin Day
Thomas’/Bimbo Bakeries USA press materials identify April 23 as National English Muffin Day across multiple years.
Source-backedFixed AnnualIn-depth guide
Spanish Language Day
United Nations language observance
Source-backedRule Based AnnualIn-depth guide
Take a Child to Work Day and Beyond
Junior Achievement is the current steward after completing acquisition in 2024 and rebranding the 1993 event lineage as Take a Child to Work Day and Beyond for 2025; Ms. Foundation sources…
Explore the mix
All topics →Topics represented on April 23
11 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
Canada Book Day
Canadian House of Commons records identify April 23 Canada Book Day as a distinct Canadian observance, name Lawrence Martin as its brainchild and the Writers’ Trust of Canada as organizer,…
Source-backedFixed AnnualIn-depth guide
English Language Day
United Nations language observance
Source-backedRule Based AnnualIn-depth guide
International Girls In ICT Day
Source-backedFixed AnnualIn-depth guide
National English Muffin Day
Thomas’/Bimbo Bakeries USA press materials identify April 23 as National English Muffin Day across multiple years.
Source-backedFixed AnnualIn-depth guide
Spanish Language Day
United Nations language observance
Source-backedRule Based AnnualIn-depth guide
Take a Child to Work Day and Beyond
Junior Achievement is the current steward after completing acquisition in 2024 and rebranding the 1993 event lineage as Take a Child to Work Day and Beyond for 2025; Ms. Foundation sources…
Source-backedFixed AnnualIn-depth guide
Talk Like Shakespeare Day
Illinois Register proclamation text records that Chicago Shakespeare Theater created Talk Like Shakespeare Day on Shakespeare’s birthday, April 23, and had marked it for several years.
Source-backedFixed AnnualIn-depth guide
U.S. Army Reserve Birthday
The U.S. Army Reserve’s official birthday page identifies 23 April 2026 as its 118th birthday.
Source-backedFixed AnnualIn-depth guide
World Book and Copyright Day
UNESCO 28 C/Resolution 3.18
Source-backedFixed AnnualIn-depth guide
World Book Night
The official World Book Night history states that the campaign was first celebrated in the UK and Ireland on 5 March 2011, moved to 23 April in 2012, and is now run in the UK by The Reading…
Source-backedFixed AnnualIn-depth guide
World Table Tennis Day
ITTF and ITTF Foundation first-party material verifies annual observance since 2015, former April 6 scheduling, current Foundation stewardship and the official move to April 23 from 2023 to…
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 →