Answer : 1. "12 जनवरी "
Explanation :

"National Youth Day" in India is celebrated on January 12th every year. This date marks the birthday of Swami Vivekananda, a prominent philosopher, thinker, and youth icon who played a key role in introducing Indian philosophies of Vedanta and Yoga to the Western world. National Youth Day aims to promote the ideals of Swami Vivekananda and inspire the youth of the country.