2025
Institutional decision
International Day of the Mediterranean Diet
The UN Digital Library records adoption of A/RES/80/174 without a vote on 18 December 2025.
Evergreen date guide
What is celebrated on December 18?
See the observances and verified observance-history milestones attached to December 18. Each observance keeps its own source and date details.
Verified history
Today in history →On this date in observance history
Selected observance milestones connected to this date, based on reviewed sources.
2022
First observance
National Crime Junkie Day
The creator’s fifth-anniversary page announces National Crime Junkie Day on December 18, 2022 as part of the five-year celebration.
2022
Institutional decision
National Crime Junkie Day
Ashley Flowers’ first-party site has a dated December 18, 2022 fifth-anniversary post directing readers to National Crime Junkie Day, establishing the observance publicly by that…
2019
Institutional decision
International Equal Pay Day
The UN Digital Library records A/RES/74/142 as adopted without a vote at the 50th plenary meeting on 18 December 2019.
2014
Institutional decision
International Albinism Awareness Day
The UN Digital Library records adoption of A/RES/69/170 on 18 December 2014.
2014
Precursor
International Albinism Awareness Day
The General Assembly resolution explicitly welcomed existing civil-society observance of 13 June before proclaiming the date with effect from 2015.
2014
Institutional decision
World Youth Skills Day
The official UN action record for UN General Assembly resolution A/RES/69/145 gives the adoption/action date as 18 December 2014.
2013
Institutional decision
International Day to End Impunity for Crimes against Journalists
The UN Digital Library records A/RES/68/163 as adopted without a vote at the 70th plenary meeting on 18 December 2013.
Curated global anchors
See the collection →Major global guides on December 18
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
Arabic Language Day
United Nations language observance
Source-backedFixed AnnualIn-depth guide
International Migrants Day
A/RES/55/93
Reviewed depth
Other in-depth guides on December 18
Source-backedFixed AnnualIn-depth guide
Guru Ghasidas Jayanti
Chhattisgarh government sources identify 18 December as Guru Ghasidas’s birth anniversary and describe the Jayanti as celebrated every year in the state; the High Court’s 2026 calendar sepa…
Source-backedFixed AnnualIn-depth guide
National Crime Junkie Day
Crime Junkie’s first-party fifth-anniversary page established National Crime Junkie Day for December 18, 2022 and ties the date to the podcast’s December 18, 2017 debut; a creator-linked cu…
Source-backedFixed AnnualIn-depth guide
National Day
Qatar Law No. 11 of 2007 establishes 18 December—the 1878 power-assumption date of Sheikh Jassim bin Mohamed bin Thani—as the State National Day and makes the annual National Day an officia…
Source-backedRule Based AnnualIn-depth guide
National Underdog Day
Historical reporting directly attributes Underdog Day to P. Moeller of Clio, Michigan; modern observance histories identify 1976 as the first observed year and preserve the third-Friday-in-…
Explore the mix
All topics →Topics represented on December 18
6 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
Arabic Language Day
United Nations language observance
Source-backedFixed AnnualIn-depth guide
Guru Ghasidas Jayanti
Chhattisgarh government sources identify 18 December as Guru Ghasidas’s birth anniversary and describe the Jayanti as celebrated every year in the state; the High Court’s 2026 calendar sepa…
Source-backedFixed AnnualIn-depth guide
International Migrants Day
A/RES/55/93
Source-backedFixed AnnualIn-depth guide
National Crime Junkie Day
Crime Junkie’s first-party fifth-anniversary page established National Crime Junkie Day for December 18, 2022 and ties the date to the podcast’s December 18, 2017 debut; a creator-linked cu…
Source-backedFixed AnnualIn-depth guide
National Day
Qatar Law No. 11 of 2007 establishes 18 December—the 1878 power-assumption date of Sheikh Jassim bin Mohamed bin Thani—as the State National Day and makes the annual National Day an officia…
Source-backedRule Based AnnualIn-depth guide
National Underdog Day
Historical reporting directly attributes Underdog Day to P. Moeller of Clio, Michigan; modern observance histories identify 1976 as the first observed year and preserve the third-Friday-in-…
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 →