International Darwin Day2026 · Date · History
The Darwin Day organization identifies 12 February as International Darwin Day and maintains current event listings; no UN designation is asserted here.
About International Darwin Day
International Darwin Day is observed on February 12, Charles Darwin’s birthday, as a science and education observance.
The modern organized movement developed through annual events in the 1990s and later nonprofit coordination; it is distinct from Darwin’s 1809 birth itself.
Why International Darwin Day matters
Darwin Day uses Darwin’s birthday as a focal point for science education, scientific inquiry and discussion of evolutionary biology.
The date rationale and the origin of the modern recurring observance are separate: February 12 comes from Darwin’s birthday, while the organized movement took shape much later.
History of International Darwin Day
Dr. Robert Stephens motivated the Humanist Community in Silicon Valley to begin an annual Darwin Day Celebration in 1995.
Professor Massimo Pigliucci organized annual Darwin Day events at the University of Tennessee beginning in 1997, and Amanda Chesworth joined Stephens in incorporating the Darwin Day Program in 2000.
The program was reincorporated in California in 2002; in 2009 it partnered with the American Humanist Association around Darwin’s bicentennial.
In 2022, responsibility for maintaining the Darwin Day website transferred to the National Center for Science Education.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
Robert Stephens, with later organizing contributions from Massimo Pigliucci and Amanda Chesworth
The official history identifies Stephens as initiating an annual celebration in 1995, Pigliucci as beginning annual events in 1997, and Chesworth as joining Stephens to incorporate the program in 2000.
First documented observance
The official history says Robert Stephens motivated the Humanist Community in Silicon Valley to initiate an annual Darwin Day Celebration in 1995.
Amanda Chesworth joined Robert Stephens to incorporate the Darwin Day Program in New Mexico.
Darwin Day organizers · Darwin Day Program incorporation
The Darwin Day Program was reincorporated in California as a nonprofit educational corporation.
Darwin Day Celebration · California reincorporation
Responsibility for maintaining the Darwin Day website transferred to NCSE.
National Center for Science Education
National Center for Science Education (Darwin Day website)
The official history states that responsibility for maintaining the Darwin Day website transferred to NCSE in 2022.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
5 fields not established in reviewed sources
Later institutional actions
Later recognition, renaming, mergers or date changes are kept separate from original establishment.
Also known as
Darwin Day
How to Observe International Darwin Day
Read about Darwin’s work and the development of evolutionary biology from scientific institutions.
Attend a science lecture, museum program or classroom discussion around February 12.
Keep Darwin’s 1809 birthday distinct from the 1990s origin of the modern organized observance.
Do not describe Darwin Day as a UN-designated or statutory public holiday without separate evidence.
International Darwin Day Facts
Darwin Day is centered on February 12, Charles Darwin’s birthday.
The modern organized annual movement began with a Silicon Valley celebration in 1995.
Additional annual events began at the University of Tennessee in 1997.
The Darwin Day Program was incorporated in 2000 and reincorporated in California in 2002.
The National Center for Science Education took responsibility for the Darwin Day website in 2022.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
Darwin Day (opens in a new tab)
Darwin Day — Official organization (opens in a new tab)
Organizer
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is International Darwin Day?
12 February The documented recurrence rule is: 12 February.
Does International Darwin Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is International Darwin Day an official public holiday?
The reviewed sources verify it within this scope: Organizer-led international science and education observance. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes International Darwin Day?
The documented basis is: The Darwin Day organization identifies 12 February as International Darwin Day and maintains current event listings; no UN designation is asserted here.. Supporting evidence includes Darwin Day — Official organization. The site does not infer a separate creator or founder unless reviewed evidence establishes one.
Is International Darwin Day international or country-specific?
The documented scope is international or global: Organizer-led international science and education observance. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-07.
When is Darwin Day?
It is observed on February 12, Charles Darwin’s birthday.
When did the modern organized Darwin Day movement begin?
The official history traces annual organized celebrations to Robert Stephens and the Humanist Community in Silicon Valley in 1995, with additional initiatives following.
Who maintains the Darwin Day website now?
Responsibility for the website transferred to the National Center for Science Education in 2022.
Is Darwin Day a UN holiday?
The organizer history does not establish a UN designation.
Other observances on February 12
These observances are also listed on February 12, 2027.
International Day against the Use of Child Soldiers
The UN Office of the Special Representative for Children and Armed Conflict states that the Optional Protocol entered into force on 12 February 2002 and that the date is now known as the In…
International Day for the Prevention of Violent Extremism as and when Conducive to Terrorism
A/RES/77/243
International Winter Bike to Work Day
The official campaign site states that International Winter Bike to Work Day began in 2013 and occurs on the second Friday in February every year.
National Plum Pudding Day
Two ANFP Wyoming chapter calendars list National Plum Pudding Day on February 12.
No One Eats Alone Day
Beyond Differences documents the program’s 2012 origin; its recent calendars and independent calendar records support the second-Friday-in-February recurrence, including February 13 in 2026.
Safetypup Day
The National Child Safety Council states that Safetypup was introduced on February 12, 1985 and that Safetypup’s birthday is February 12; the Georgetown, Ohio Police Department independentl…