Primbon Watak Tanggal Lahir is a free Android application that aims to provide a comprehensive guide to Javanese birthdays. The app is designed to help users determine the significance of their birth date and the corresponding Javanese calendar day. The app is based on the Javanese belief that events and a person's character can be determined by examining the traditional calendar. The app provides a complete guide to the Javanese day of birth, or weton, which is a combination of the seven days in a week and the five Javanese pasaran days. The cycle repeats every 35 days, so according to Javanese calculations, your day of birth repeats every five weeks starting from your birth date.

The app provides a comprehensive guide to the characteristics and traits associated with each weton. It also provides an explanation of neptu, which is the numerical value associated with each Javanese day. Primbon Watak Tanggal Lahir is an easy-to-use application that can be downloaded on any Android device. It is a useful tool for those who want to learn more about Javanese birthdays and the associated characteristics and traits.