Hanuman Jayanti or Hanumath Jayanti is celebrated as the birthday of Hanuman, the monkey god. In some parts of India it is celebrated on the 15th day of the Shukla Paksha, during the month of Chaitra.
Hanuman is an ardent devotee of Lord Rama, and is worshipped for his unflinching devotion to the god. Hanuman Jayanti is an important festival of Hindus. Hanuman is the symbol of strength and energy. Hanuman is said to be able to assume any form at will, wield rocks, move mountains, dart through the air, seize the clouds and rival Garuda in swiftness of flight. He is worshipped in folk tradition as a deity with magical powers and the ability to conquer evil spirits.
In Maharashtra, Hanuman Jayanti is celebrated on the full moon day (pūrnima) of the Hindu lunar month of Chaitra. A special feature of Hanuman Jayanti is that according to some religious almanacs (panchāngs) the birthday of Hanuman falls on the fourteenth day (chaturdashi) in the dark fortnight of the month of Ashvin while according to others it falls on the full moon day in the bright fortnight of Chaitra. In the states of Tamil Nadu and Kerala, the Hanuman Jayanti is celebrated in the month of Margazhi . There it is believed that Hanuman or Anjaneya was born on Moola Nakshatra,on the new moon day (amavasya) in the month of Margazhi. In Odisha, the Hanuman Jayanti is celebrated on the first day of Baisakha month as per Oriya calendar. There it is also celebrated as new year for all Oriyas (i.e. Maha Vishuva Sankranti).In Andhra, Hanuman Jayanti is celebrated on the tenth day of bahula paksha or Krishna paksha in the month of Vaishaka.