"I have been a practicer of yoga for years, and you can't believe the positive difference it has made in my life," he said in a tweet. "Yoga is the anchor of my life."
"The fact that 177 nations across all continents came together and co-sponsored the resolution shows the integrative power of yoga.
"I urge all of you, especially the youth, to take up yoga and practice it diligently and regularly. It will truly transform your lives as well."
The UN General Assembly adopted a resolution, with a record number of 175 country co-sponsors, for observance of International Day of Yoga on June 21 each year.
Prime Minister Narendra Modi, who had proposed holding an international yoga day in his UN General Assembly speech in Sep 27 this year, had earlier voiced his elation on twitter.
"Elated! Have no words to describe my joy on the UN declaring 21st June as 'International Day of Yoga.' I fully welcome the decision," he tweeted.
The 69th Session of the United Nations General Assembly Thursday adopted by acclamation draft Resolution A/69/L.17 with a record number of 175 countries co-sponsoring it. Tweeting his thanks, Modi said: "I profusely thank all 177 nations across the world who co-sponsored the resolution to declare 21st June as 'International Day of Yoga'."
"Countless people across the world made Yoga an integral part of their lives. Congrats to them! This will inspire many more people towards Yoga."
"Yoga has the power to bring the entire humankind together! It beautifully combines Gyan (knowledge), Karm (work) and Bhakti (devotion)," he wrote.
Modi had indicated that June 21, one of the two solstices, which is the longest day in the Northern Hemisphere, has special significance in many parts of the world and could be considered for adoption as the International Day of Yoga by the United Nations each year.