In Jain tradition, each Tirthankara does not have a specific day of the week universally dedicated to them, as is common in some other religions. However, it is common among many Jains to associate certain days with particular Tirthankaras for devotional purposes.

For Lord Parshwanath, the 23rd Tirthankara, many Jains observe special prayers, fasting (upvas), and rituals on Saturdays. Temples dedicated to Lord Parshwanath may also have special puja or rituals on this day.

However, it is important to note that these practices may vary by region, sect (Svetambara or Digambara), and community. The association of Saturday with Lord Parshwanath is a popular devotional practice, but not a doctrinal requirement in Jain scriptures.