The International Day of Happiness (known as Happiness Day) is celebrated throughout the world on the 20th of March. The International Day of Happiness (“Happiness Day”) was founded by United Nations adviser Jayme Illien on June 28, 2012, when all 193 member states of the United Nations General Assembly unanimously adopted UN resolution 66/281 The International Day of Happiness, following a multiyear campaign initiated in 2011 by the Illien Global Public Benefit Corporation.