In state of Maharashtra Hanuman Jayanti is celebrated on month of Chaitra on full moon day. In states of Kerala and Tamil Nadu, Hanuman Jayanti is celebrated during 15 Dec to 14 Jan in the month of Margazhi. In Orissa Hanuman Jayanti is celebrated according to Oriya calendar on the first day of Baisakha month. In Andhra Pradesh Hanuman Jayanti is celebrated in the month of Vaishaka on the tenth day of bahula paksham.
On this sacred day, devotees go to the temples and recite Hanuman Mantra and Hanuman Chalisa. Hanuman Bhajans are played in the temples for all the devotees. Hanuman was born to Anjani Devi and Wind-God his father. He is an avatar of god Shiva and is also known by the names of Bajrangabali, Marutsuta, Mahavira, Pavanasuta and Pavankumar. There no temple of Rama where you will not find the idol of his loyal devotee Hanuman. Hanuman was a true karma yogi and a selfless worker.
He was a Brahmachari and served Rama with full devotion and pure love. He dedicated his life towards serving Rama. He proved his devotion towards Rama by restoring Lakshmana to life again, burning the city of Lanka and helping Rama fight the war with Ravana. In the holyday of Hanuman Jayanti 2012, those who will fast, spend whole day reciting Ram-Nam, worship Lord Hanuman will sure be blessed by the god with success.