Vaisakhi (IAST: vaisākhī), also pronounced as Baisakhi is a historical and religious festival in Sikhism. It is usually celebrated on 13 or 14 April every year, and celebrates the start of the month of Vaisakha. For Sikhs, ^[5][6][7][8] the day commemorates the formation of Khalsa panth of warriors under Guru Gobind Singh in 1699.^{[1][2][9][10]} For many Hindus, the holiday is known as Vaisakha Sankranti and celebrates the Solar new year, based on the HinduVikram Samvat calendar. Vaisakhi marks the first day of the month of Vaisakha. It is additionally a spring harvest festival for many Indians.^[9]