The Saka Era is one of the historical calendar eras used in the Indian subcontinent. Its epoch (Year 0) corresponds to the year 78 CE in the Gregorian calendar. While its origin is debated, it is widely associated with the reign of the Kushana king Kanishka I, or alternatively, with the victory of a Saka king like Chashtana over some other ruler. The Government of India officially adopted the Saka calendar alongside the Gregorian calendar as the national calendar in 1957.