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Evergreen date guide

What is celebrated on June 18?

See the observances and verified observance-history milestones attached to June 18. 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.

2018
Institutional decision

National Windrush Day

The establishing government announcement was published on 18 June 2018.

2017
First observance

Sustainable Gastronomy Day

United Nations briefing material records 18 June 2017 as the first Sustainable Gastronomy Day.

2015
First observance

Constitution Day

State House identified June 18, 2014 as the last June 18 National Day and issued a Constitution Day message for June 18, 2015, establishing the named transition in official usage.

About this date

What this date contains

3 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.

1 have a country-specific scope

Country-specific observances are not presented as worldwide events.

3 have in-depth guides

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

Reviewed depth

Other in-depth guides on June 18

Source-backedFixed AnnualIn-depth guide

Constitution Day

18 June annually · Seychelles / national public holiday and civic observance

Seychelles government sources list Constitution Day as a public holiday on 18 June, connect the date with the 1993 constitutional referendum/adoption, and document the 2015 transition from…

Source-backedFixed AnnualIn-depth guide

Sustainable Gastronomy Day

18 June · FAO / United Nations / international observance

A/RES/71/246

Explore the mix

Topics represented on June 18

All topics →
Civic, Remembrance & History 1Community, Causes & Advocacy 1Food, Drink & Hospitality 1
3 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Constitution Day

18 June annually · Seychelles / national public holiday and civic observance

Seychelles government sources list Constitution Day as a public holiday on 18 June, connect the date with the 1993 constitutional referendum/adoption, and document the 2015 transition from…

Source-backedFixed AnnualIn-depth guide

Sustainable Gastronomy Day

18 June · FAO / United Nations / international observance

A/RES/71/246

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 →