When ‘Time’ substance is added to the concept of Panchastikaya, then 6 these six together are collectively called as Saddravya. Time is an important factor in the context of the universe.
The final ajiva or non- living entity to be considered is Kaal. It assists in bringing about the changes take place in the universe. It is eternal, formless and infinite. Kaal is to be inferred from duration, transformation of things into various modes, action, movement, priority and posteriority.