What Is the Assamese Calendar (Bhaskarabda)?
The Assamese calendar is the regional lunisolar calendar used in the state of Assam, India. It is dated according to the Bhaskarabda era, named in honor of King Bhaskaravarman of Kamarupa (600–650 CE), who was a contemporary of King Harshavardhana.
The Assamese year begins on Bohag 1 (mid-April), which marks the spring festival of Rongali Bihu. Because the calendar follows solar transits across sidereal zodiac signs, each month starts when the Sun enters a new Rashi (Sankranti).