Hanuman Jayanti 2016 dates based on Hindu Calendar. Hanuman Jayanthi is celebrated as the birthday of Lord Hanuman. It is observed on the full moon (Purnima) day in the Hindu month of Chaitra (March – April). In 2016, Hanuman Jayanthi is on April 22. Lord Hanuman, the son of Lord Vayu is one of the most popular god in hindu epic Ramayana. He is a Chiranjeevi – one blessed with immortality.