In which century or year the paryushan celebration started

The available sources describe Paryushan as the most important festival in Jainism, observed annually in August or September by both the Shvetämbar and Digambar sects. It is characterized by spiritual activities such as fasting, prayer, meditation, and scriptural study. However, none of the referenced texts or books in the context explicitly mention the historical origin date or the century in which Paryushan was first celebrated. The festival's significance, rituals, and evolution are discussed, but the precise starting point in history remains unspecified in these materials.