Vaisakha is a month of the Hindu calendar that corresponds to April/May in the Gregorian Calendar. In the Indian national calendar, Vaisakha is the second month of the year. It is the first month of the Vikram Samvat calendar, Odia calendar, Punjabi calendar, Assamese calendar (where it is called Bohag) and the Bengali calendar (where it is called Boishakh). This month lies between the second half of April And The First Half Of May. Regional calendars used in the Indian subcontinent have two aspects: lunar and solar. Lunar months begin with Chaitra and solar months start with Vaisakha Sankranti. However, regional calendars mark when the official new year is celebrated. In regions such as Maharashtra which begin the official new year with the commencement of the lunar year, the solar year is marked by celebrating Vaisakha Sankranti. Conversely, regions starting the new year with Vaisakha Sankranti, give prominence to the start of the lunar year in Chaitra. In the Vedic calendar, it is called Madhava, and in the Vaishnava calendar, it is called Madhushudana month. From Wikipedia