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Evergreen date guide

What is celebrated on June 23?

See the observances and verified observance-history milestones attached to June 23. Each observance keeps its own source and date details.

Verified history

On this date in observance history

Today in history →

Selected observance milestones connected to this date, based on reviewed sources.

2021
First observance

National Detroit-Style Pizza Day

A contemporaneous Little Caesars release describes June 23, 2021 as the first National Detroit-Style Pizza Day.

2013
First observance

National Waiters Day

Contemporary Restaurant Online coverage describes the June 23, 2013 event as the first ever National Waiters Day.

2011
First observance

International Widows' Day

United Nations reporting states that 23 June 2011 was observed as the first International Widows’ Day.

2011
Precursor

National Detroit-Style Pizza Day

Detroit city recognition of Buddy’s Pizza on June 23 preceded the 2021 national observance using the same calendar date.

2003
First observance

United Nations Public Service Day

A United Nations Note to Correspondents dated 19 June 2003 announced that United Nations Public Service Day would be inaugurated on 23 June and marked for the first time at UN Hea…

1992
Institutional decision

National Wattle Day

The proclamation states that it was given under the Governor-General’s hand and the Great Seal on June 23, 1992; gazettal followed on August 24, 1992.

1962
First observance

National Day

The Grand Ducal Court historical timeline states that 1962 was the first celebration on June 23.

About this date

What this date contains

10 observances

Each observance is shown once in this view, with its own source and scope details available on the guide page.

0 repeat predictably

0 use a fixed annual date and 0 follow a reusable calendar rule.

0 are edition-specific

These dates are shown only for the year or edition that has been confirmed.

5 have a country-specific scope

Country-specific observances are not presented as worldwide events.

10 have in-depth guides

These pages include reviewed meaning, history, activities, facts and FAQs.

Curated global anchors

Major global guides on June 23

See the collection →

A reviewed starting point drawn from prominent global observances with strong institutional or organizer sources. Each observance keeps its own documented status and scope.

Reviewed depth

Other in-depth guides on June 23

Source-backedFixed AnnualIn-depth guide

Fête de l’indépendance

23 June annually · Canton of Jura, Switzerland / cantonal observance

The Canton of Jura’s official calendars list Fête de l’indépendance on 23 June, including 23 June in both 2026 and 2027.

Source-backedFixed AnnualIn-depth guide

International Widows' Day

23 June · United Nations / international observance

A/RES/65/189

Source-backedFixed AnnualIn-depth guide

National Day

23 June · Luxembourg

Luxembourg’s Grand Ducal Court explains that a Grand-Ducal decree/order of 23 December 1961 fixed 23 June as the official day of public celebration of the Grand Duke’s birthday, with the fi…

Source-backedFixed AnnualIn-depth guide

National Detroit-Style Pizza Day

23 June · United States / Buddy’s Pizza-founded food observance

National Day Calendar’s proclamation and Detroit tourism materials identify Buddy’s Pizza as the founder and June 23 as National Detroit-Style Pizza Day.

Source-backedFixed AnnualIn-depth guide

National Family Owned & Operated Businesses Day

23 June · United States / family-business recognition day established by the AG Center

Kennesaw State University’s Family Enterprise Center identifies June 23 as the annual observance and states the AG Center established it in 2021; registration records corroborate the founde…

Explore the mix

Topics represented on June 23

All topics →
Civic, Remembrance & History 3Workplace, Professions & Appreciation 2Arts, Entertainment & Lifestyle 2Community, Causes & Advocacy 1Food, Drink & Hospitality 1Relationships & Family 1
10 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Fête de l’indépendance

23 June annually · Canton of Jura, Switzerland / cantonal observance

The Canton of Jura’s official calendars list Fête de l’indépendance on 23 June, including 23 June in both 2026 and 2027.

Source-backedFixed AnnualIn-depth guide

International Widows' Day

23 June · United Nations / international observance

A/RES/65/189

Source-backedFixed AnnualIn-depth guide

National Day

23 June · Luxembourg

Luxembourg’s Grand Ducal Court explains that a Grand-Ducal decree/order of 23 December 1961 fixed 23 June as the official day of public celebration of the Grand Duke’s birthday, with the fi…

Source-backedFixed AnnualIn-depth guide

National Detroit-Style Pizza Day

23 June · United States / Buddy’s Pizza-founded food observance

National Day Calendar’s proclamation and Detroit tourism materials identify Buddy’s Pizza as the founder and June 23 as National Detroit-Style Pizza Day.

Source-backedFixed AnnualIn-depth guide

National Family Owned & Operated Businesses Day

23 June · United States / family-business recognition day established by the AG Center

Kennesaw State University’s Family Enterprise Center identifies June 23 as the annual observance and states the AG Center established it in 2021; registration records corroborate the founde…

Source-backedFixed AnnualIn-depth guide

Olympic Day

23 June · IOC-led global Olympic Movement observance

IOC historical material verifies 42nd Session approval in January 1948, the first World Olympic Day on June 23, 1948 and the date’s link to the June 23, 1894 birth of the modern Olympic Mov…

Source-backedFixed AnnualIn-depth guide

Sholes–Glidden–Soule typewriter patent anniversary

23 June · Technology-history anniversary / U.S. typewriter patent

The Smithsonian National Museum of American History records that the Sholes, Glidden & Soule typewriter patent model was awarded U.S. Patent No. 79,265 on 23 June 1868.

Source-backedFixed AnnualIn-depth guide

Victory Day (Estonia)

23 June annually · Estonia / national public holiday and civic-military commemoration

Estonia’s Public Holidays and Days of National Importance Act lists 23 June as Victory Day and a public holiday/day of rest. Estonian presidential, parliamentary and Defence League sources…

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 →