globalobservance.info
Evergreen date guide

What is celebrated on December 31?

See the observances and verified observance-history milestones attached to December 31. 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.

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.

3 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 December 31

Source-backedFixed AnnualIn-depth guide

National Heroes Day

31 December annually · Timor-Leste / fixed public holiday

Timor-Leste’s official 2026 holiday list, applying Law No. 10/2005, lists 31 December as National Heroes Day among fixed public holidays.

Source-backedFixed AnnualIn-depth guide

Restauration de la République

31 December annually; 31 December 2026 listed as an official holiday · Canton of Geneva, Switzerland / cantonal official holiday

The Canton of Geneva’s official holiday calendar lists Restauration de la République on 31 December, including 31 December 2026 and subsequent calendars.

Source-backedFixed AnnualIn-depth guide

World Azerbaijanis Solidarity Day

31 December annually · Azerbaijan / national observance

Azerbaijan’s official presidential holiday information identifies 31 December as World Azerbaijanis Solidarity Day; current presidential messages use the same name.

Explore the mix

Topics represented on December 31

All topics →
Civic, Remembrance & History 2Community, Causes & Advocacy 1
3 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

National Heroes Day

31 December annually · Timor-Leste / fixed public holiday

Timor-Leste’s official 2026 holiday list, applying Law No. 10/2005, lists 31 December as National Heroes Day among fixed public holidays.

Source-backedFixed AnnualIn-depth guide

Restauration de la République

31 December annually; 31 December 2026 listed as an official holiday · Canton of Geneva, Switzerland / cantonal official holiday

The Canton of Geneva’s official holiday calendar lists Restauration de la République on 31 December, including 31 December 2026 and subsequent calendars.

Source-backedFixed AnnualIn-depth guide

World Azerbaijanis Solidarity Day

31 December annually · Azerbaijan / national observance

Azerbaijan’s official presidential holiday information identifies 31 December as World Azerbaijanis Solidarity Day; current presidential messages use the same 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 →