The International Day of Happiness (March 20, Gregorian) was first established as a global observance in 2013 and added to the Gregorian calendar to emphasize the importance of happiness and well-being as fundamental goals for people worldwide. This initiative was adopted by the United Nations following a proposal from Bhutan, a country renowned for its focus on Gross National Happiness. In 2012, the United Nations General Assembly decided to designate March 20 as the International Day of Happiness, aiming to promote policies that increase happiness and social well-being in various communities. For this reason, the day was officially added to the Gregorian calendar in 2013 as an international observance. Since then, the day has been marked in different countries with events and activities to raise public awareness about the significance of happiness and mental health. Across the world, the International Day of Happiness is observed with educational programs, workshops, social gatherings, and awareness campaigns. The occasion provides an opportunity for governments, organizations, and individuals to discuss and share strategies for enhancing happiness and quality of life. The International Day of Happiness is now recognized as a global event, observed annually on March 20.