Vaisakhi (Punjabi; also known as Baisakhi) is an ancient harvest festival in Punjab, which also marks beginning of a new solar year, and new harvest season. Baisakhi also has religious significance for Hindus and Sikhs. It falls on the first day of the Vaisakh month in the solar Nanakshahi calendar, which corresponds to April 14 in the Gregorian calendar.
Vaisakhi is one of the most significant holidays in Sikh calendar, commemorating the establishment of the Khalsa in 1699; which marks the Sikh New Year. It also is observed as the beginning of the new year by Indians in West Bengal, Kerala, and some other regions of India. The particular significance attached to the occasion shows regional variation outside of Punjab.
In Himachal Pradesh, Hindu Goddess Jwalamukhi is worshipped on Vaisakhi, while in Bihar, Sun-god Surya is honored. The festival is celebrated as Rongali Bihu in Assam, Naba Barsha in Bengal, Puthandu in Tamil Nadu, Vishnu (or Vaishakhi) in Kerala, and the Sinhalese/Tamil new year festival in Sri Lanka. Besides Punjab, Vaisakhi is widely celebrated as a harvest festival in other northern states of India, such as Haryna, Himachal Pradesh and Uttarachal.