December 18 National Days

December 18, 2025, is the 353rd day of the year, with 13 days remaining until the end of the year. Falling on a Thursday in the 50th week, the date highlights language and cultural heritage, migration and social awareness, andholiday traditions like baking cookies.

Below is a list of all 10 national and international days celebrated on December 18, each with a brief explanation.

National & International Days on December 18

Answer the Telephone Like Buddy the Elf Day is inspired by the 2003 film Elf. The observance encourages people to answer phone calls using Buddy’s cheerful greeting, “(Your name) the Elf, what’s your favorite color?”—a reference to a scene in which the character ignores normal office etiquette. The day is meant to add humor and holiday cheer during a busy time of year.

Bake Cookies Day focuses on baking rather than simply enjoying cookies. The day became widely known after Matt Nader, founder of the Blue Chip Cookie Company, promoted it in 1987 as a way to celebrate home baking. Coming one week before Christmas, it fits naturally with holiday traditions like cookie swaps, baking gifts, and making treats to share. Unlike National Cookie Day on December 4, this observance centers on the process of baking.

Bake Cookies Day

Flake Appreciation Day invites people to observe and appreciate snowflakes, which are common in many regions during December. Snowflakes form with a six-sided structure due to how water molecules bond, and scientists group them into around 35 general pattern types, despite each one being unique.

International Migrants Day was established by the United Nations, the day recognizes the rights, contributions, and challenges of people living outside their country of origin. The date marks the 1990 adoption of an international convention protecting migrant workers and their families. The observance highlights the global role migrants play in economies, communities, and cultural exchange.

National Crime Junkie Day was created in 2022 by Ashley Flowers, host of the Crime Junkie podcast. The day encourages true crime audiences to engage responsibly. Its purpose is to raise awareness of unsolved cases, support victims’ families, and promote ethical involvement, such as funding DNA testing or supporting organizations working on cold cases.

National Regifting Day* (Third Thursday of December) recognizes the idea of passing along unused or unwanted gifts to someone who will appreciate them more. The observance was created in 2006 by Money Management International to encourage people to think more carefully about spending during the holidays and to avoid unnecessary purchases. Instead of letting items sit unused or throwing them away, regifting treats those items as resources that can be reused.

National Roast Suckling Pig Day highlights a traditional dish made from a young piglet fed only on its mother’s milk, resulting in especially tender meat. Roast suckling pig is featured in celebratory meals across many cultures, including Christmas feasts in Spain, holiday gatherings in Latin America, and formal banquets in parts of Asia.

National Twin Day celebrates the bond shared by identical and fraternal twins, who account for roughly one in every 30 births. The day is often marked by shared photos, stories, or coordinated outfits, and it is separate from the Twins Days Festival held each summer in Twinsburg, Ohio.

Wear a Plunger on Your Head Day embraces silliness as a way to relieve stress during the holiday season. Its origins are unclear, though it is sometimes linked to a personal tradition started by Vern Halsey.

World Arabic Language Day commemorates the 1973 decision by the United Nations to adopt Arabic as an official working language. Spoken by more than 400 million people, Arabic has played a major role in science, literature, and scholarship, including preserving and transmitting knowledge across civilizations.