Hindi Divas (Hindi: हिन्दी दिवस) is an annual day celebrated on 14 September in Hindi speaking regions of India. Mostly this celebration is a government-sponsored event in Central government of India offices, firms, schools and other institutions. It serves to promote and propagate the Hindi language. Its importance is demonstrated by feasts, events, competitions and other services held on this day. The event also serves as a patriotic reminder to Hindi-speaking populations of their common roots and unity.
Hindi Diwas commemorates the day when the Constituent Assembly of India accepted Hindi as the official language of the country along with English. The listing of Hindi as official language took place on September 14, 1949
Indian Railways is one of the leading Govt. organization which promote Hindi usages across the India including the Southern state of India.
Hindi is spoken as a native language by 500 million people and is recognized as the 2nd most-spoken language in the world.Hindi Divas is celebrated on 14 September because, on this day in 1949, the Constituent Assembly of India had adopted Hindi written in Devanagari script as the official language of the Republic of India. The decision of using Hindi as the official language was ratified by the Constitution of India that came into effect on 26 January 1950. Under the Article 343 of the Indian Constitution, Hindi written in Devanagari script was adopted as the official language. Now there are 22 Scheduled languages of India. Among them, 2 languages are officially used at Union government of India level: Hindi and English.
Source – Wikipedia