When Is International Yoga Day Marked. On december 11, 2014, the united nations proclaimed june 21 as international yoga day. The idea to mark the longest day of the year in the northern hemisphere, june 21, as the international yoga day was.

The idea to mark the longest day of the year in the northern hemisphere, june 21, as the international yoga day was. The international yoga day, marked on june 21, since 2015 is a gift of india to the world.