Purana - Pura (old) api (also) Navam (new) - 3 things are witnessed by Acharyas with respect to Purana 1. Recensions (versions) 2. Interpolations (some sloka or parts are added) 3. Continuously updated - Bhavishyat Purana was even updated till 1000 years back Purana like Bhagavata, Vishnu, Agni, Vayu, Shiva, Skaanda are very old and Purana like Bhavishyat are new. These are based on the updations and not on when they were started. Staring time of Purana can't be established as Purana is very old and also new. It is not Itihasa [iti - like this, iha - here (or ha - indeed), aasa - happened] means history. This is the reason why Purana is not taken as a Pramana (evidence) in our shastra /jnana parampara. What are the Pramana(s): Veda or Shruti - All Aastika shastra traditions accept shruti pramana. In the past one is considered as Aastika only if that person accepts Vedas as Pramana. Now Aastika means a God believer - this is actually wrong notion. 1. Pratyaksha (Sensory perception...