2023-07-30 00:00:00 The Javanese calendar was first used during the Mataram Kingdom. Under the rule of Sultan Agung Adi Prabu Hanyakrakusuma (1613-1645 AD), the Javanese calendar began to be widely used. Calculation of dates on the Javanese calendar is unique. Because, in his calculations, the Javanese calendar was influenced by the Islamic, Hindu and Julian calendars which came from Rome. If you need the Javanese calendar to help you on a daily basis, see the complete list below.