Happiness is a state, not a trait; in other words, it isn’t a long-lasting, permanent feature or personality trait, but a more fleeting, changeable state. The theme of the International Day of Happiness 2021 is “Happiness For All, Forever”. It's spring and Holi is round the corner. What can be a better time to celebrate International Day of Happiness. A day dedicated to happiness is celebrated every year on March 20.International Day of Happiness is a United Nations designated day "to recognise the importance of happiness in the lives of people around the world. Amid the COVID-19 pandemic, on International Day of Happiness, it's important to tell each other that we are never alone.