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Evergreen date guide

What is celebrated on April 5?

See the observances and verified observance-history milestones attached to April 5. 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.

2023
Later action

Marketing Operations Appreciation Day

The 2023 observance broadened appreciation language beyond Marketing Operations to include additional operations professionals, including Revenue Operations.

2020
First observance

International Day of Conscience

The United Nations Alliance of Civilizations described the April 2020 commemoration as the first International Day of Conscience.

2018
Institutional decision

First Philippine Republic Day

The Senate legislative reference entry and statutory text give April 5, 2018 as the approval date.

2006
Institutional decision

Endangered Species Day

GovInfo records April 5, 2006 as the action date on which S. Res. 431 was considered and agreed to.

About this date

What this date contains

8 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.

8 have in-depth guides

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

Curated global anchors

Major global guides on April 5

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 April 5

Source-backedRule Based AnnualIn-depth guide

A Drop of Water is a Grain of Gold

First Sunday in April (traditionally) · Turkmenistan

Official Turkmen government material verifies the national observance on the first Sunday in April, including a 2014 presidential decree and government-led celebrations. Original creator an…

Source-backedFixed AnnualIn-depth guide

First Contact Day

5 April in Star Trek canon and fan celebration · Star Trek franchise / science-fiction fandom

Official Star Trek sources mark April 5 as First Contact Day, explicitly frame the April 5, 2063 human–Vulcan encounter as fictional canon, document an official 2021 real-world fan event, a…

Source-backedRule Based AnnualIn-depth guide

Geologist Day

First Sunday in April · Russia / geology profession

Russian federal geological sources trace Geologist Day to a 31 March 1966 decree of the Presidium of the Supreme Soviet of the USSR, record the first observance that April and preserve the…

Source-backedFixed AnnualIn-depth guide

Gold Star Spouses Day

5 April · United States military-family remembrance and recognition observance

U.S. Department of Defense source verification

Source-backedFixed AnnualIn-depth guide

National Deep Dish Pizza Day

5 April · United States / brand-created and broadly promoted informal food observance

UNO stated in 2010 that April 5 is National Deep Dish Pizza Day and that it was first designated in 2009 for UNO’s anniversary; UNO continues to promote the observance.

Source-backedFixed AnnualIn-depth guide

National Nebraska Day

5 April · United States / National Day Calendar National State Days series — Nebraska

National Day Calendar lists National Nebraska Day on 5 April. The U.S. Senate records Nebraska’s admission/statehood date as 1 March 1867. The two dates are deliberately kept separate so th…

Explore the mix

Topics represented on April 5

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

All observances on this date

Source-backedRule Based AnnualIn-depth guide

A Drop of Water is a Grain of Gold

First Sunday in April (traditionally) · Turkmenistan

Official Turkmen government material verifies the national observance on the first Sunday in April, including a 2014 presidential decree and government-led celebrations. Original creator an…

Source-backedFixed AnnualIn-depth guide

First Contact Day

5 April in Star Trek canon and fan celebration · Star Trek franchise / science-fiction fandom

Official Star Trek sources mark April 5 as First Contact Day, explicitly frame the April 5, 2063 human–Vulcan encounter as fictional canon, document an official 2021 real-world fan event, a…

Source-backedRule Based AnnualIn-depth guide

Geologist Day

First Sunday in April · Russia / geology profession

Russian federal geological sources trace Geologist Day to a 31 March 1966 decree of the Presidium of the Supreme Soviet of the USSR, record the first observance that April and preserve the…

Source-backedFixed AnnualIn-depth guide

Gold Star Spouses Day

5 April · United States military-family remembrance and recognition observance

U.S. Department of Defense source verification

Source-backedFixed AnnualIn-depth guide

National Deep Dish Pizza Day

5 April · United States / brand-created and broadly promoted informal food observance

UNO stated in 2010 that April 5 is National Deep Dish Pizza Day and that it was first designated in 2009 for UNO’s anniversary; UNO continues to promote the observance.

Source-backedFixed AnnualIn-depth guide

National Nebraska Day

5 April · United States / National Day Calendar National State Days series — Nebraska

National Day Calendar lists National Nebraska Day on 5 April. The U.S. Senate records Nebraska’s admission/statehood date as 1 March 1867. The two dates are deliberately kept separate so th…

Source-backedFixed AnnualIn-depth guide

National Recommit to Your Fitness Day

5 April · United States / F45 Training-created fitness campaign

F45 Training launched National Recommit to Your Fitness Day in 2025 as an annual April 5 initiative; its first-party announcement says 4/5 is a nod to the F45 name.

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 →