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Evergreen date guide

What is celebrated on December 11?

See the observances and verified observance-history milestones attached to December 11. 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.

2014
Institutional decision

International Day of Yoga

Exact action/adoption date of the establishing instrument in the reviewed institutional/legal source.

2008
Institutional decision

World Humanitarian Day

A/RES/63/139 states that the General Assembly adopted the resolution on 11 December 2008.

2003
First observance

International Mountain Day

A/RES/57/245 designated 11 December as International Mountain Day beginning in 2003, and FAO records annual observance since then.

About this date

What this date contains

4 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.

2 have a country-specific scope

Country-specific observances are not presented as worldwide events.

4 have in-depth guides

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

Curated global anchors

Major global guides on December 11

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.

Source-backedFixed AnnualIn-depth guide

International Mountain Day

11 December · United Nations international observance

A/RES/57/245

Reviewed depth

Other in-depth guides on December 11

Source-backedFixed AnnualIn-depth guide

Anniversary of the Statute of Westminster

11 December annually · Canada / federal commemorative and flag protocol

Canadian Heritage states that the anniversary of the Statute of Westminster is celebrated each year on December 11 and describes the associated federal flag protocol.

Source-backedFixed AnnualIn-depth guide

Proclamation of the Republic of Upper Volta / 11 December national-day context

11 December 1958 republic proclamation; modern 11 December national-day commemoration · Burkina Faso / republic-history and national-day context

The Presidency of Burkina Faso states that the Republic of Upper Volta was proclaimed on 11 December 1958. Current government sources call 11 December the national celebration and frame it…

Source-backedFixed AnnualIn-depth guide

UNICEF founding anniversary

11 December annually — UNICEF founding anniversary, not public holiday · UNICEF / organizational founding anniversary

UNICEF states that the United Nations established UNICEF on 11 December 1946; the date supports a founding-anniversary page rather than a formal UN “UNICEF Birthday” observance.

Explore the mix

Topics represented on December 11

All topics →
Civic, Remembrance & History 3Animals, Nature & Environment 1
4 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Anniversary of the Statute of Westminster

11 December annually · Canada / federal commemorative and flag protocol

Canadian Heritage states that the anniversary of the Statute of Westminster is celebrated each year on December 11 and describes the associated federal flag protocol.

Source-backedFixed AnnualIn-depth guide

International Mountain Day

11 December · United Nations international observance

A/RES/57/245

Source-backedFixed AnnualIn-depth guide

Proclamation of the Republic of Upper Volta / 11 December national-day context

11 December 1958 republic proclamation; modern 11 December national-day commemoration · Burkina Faso / republic-history and national-day context

The Presidency of Burkina Faso states that the Republic of Upper Volta was proclaimed on 11 December 1958. Current government sources call 11 December the national celebration and frame it…

Source-backedFixed AnnualIn-depth guide

UNICEF founding anniversary

11 December annually — UNICEF founding anniversary, not public holiday · UNICEF / organizational founding anniversary

UNICEF states that the United Nations established UNICEF on 11 December 1946; the date supports a founding-anniversary page rather than a formal UN “UNICEF Birthday” 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 →