Wikipedia
Puthandu
Puthandu ( Tamil புத்தாண்டு), better known as Tamil New Year, is the celebration of the first day of the Tamil new year in mid-April by Tamils in Tamil Nadu and Puducherry in India, Sri Lankan Tamils and Indian Tamils of Sri Lanka, and by Tamils in Malaysia, Singapore, Réunion and Mauritius. On this day, Tamil people greet each other by saying "Puttāṇṭu vāḻttukkaḷ!" or "Iṉiya tamiḻ puttāṇṭu nalvāḻttukkaḷ!" . The festive occasion is in keeping with the Hindu solar calendar.