On December 11, 2014, the United Nations General Assembly declared the 21st of June every year to be International Yoga Day. India officially gave the proposal. 175 countries supported it.
For a calendar of events taking place across the globe, visit: http://idayofyoga.org/
To read Swami Veda Bharati's Message for International Yoga Day, please use this link: http://ahymsin.org/main/swami-veda-bharati/message-for-international-yoga-day-june-21.html