International/World days existed before the establishment of the UN, but the United Nations adopted them as a powerful tool. They celebrate specific days, weeks, years, and decades with particular themes, promoting international awareness* and action** on these issues.
*Each international day offers organizations the chance to organize awareness-raising activities related to the day’s theme.
** For instance, on May 22, the International Day for Biological Diversity is celebrated, during which the UN encourages its member states to sign and ratify the Cartagena Protocol for the protection of biological diversity.