Hanuman Jayanti is observed on Chaitra Purnima in Maharashtra, Karnataka, Andhra Pradesh, and many other states in India. In 2012, Hanuman Jayanthi date is April 6. It is also celebrated as Hanuman Vijayotsavam.
Hanuman Jayanti is also observed in Vaishakh month in some places of Andhra Pradesh and Karnataka. Gujarat celebrates it on a day prior to Diwali. In Tamil Nadu, Hanuman Jayanti is celebrated in December – January during Margali month of Tamil calendar.