The national calender of India is based on the Saka Era. Chaithra and Phalguna are the first and the last months in the Calender.Saka Era began in 78 AD at the time of King Kanishka.
The days of Saka Calender permanently correspond to the Gregorian calender and Chaithra falls on march 22nd in a common year and March 21st in a leap year .It was introduced in the year 1957 from march 22nd,the day on which Kaniska came to the throne.