Volunteer Day, or Día del Cooperante, is observed in Spain every September 8. This annual event was initiated by the Spanish Agency for International Development Cooperation (AECID), which was founded in 1988 and focuses on designing and implementing development cooperation projects and humanitarian work abroad. The date commemorates the adoption of the United Nations Millennium Declaration on September 8, 2000, which outlined goals such as eradicating hunger and extreme poverty and promoting gender equality. The day is dedicated to recognizing the contributions of Spanish volunteers who work towards sustainable development and poverty eradication in vulnerable regions globally. Each year, AECID publishes a report detailing the number and achievements of Spanish volunteers abroad, highlighting their significant impact.