The Great River Saraswati in the Rigweda

It took thousands of years for it to become so intense that the decline of the monsoon, that the river saraswati started drying out. So they clearly identifi the hgagar haker river with the Saraswati. There is no doubt about it, that it is the saraspate river, the disarasote, of ancient indian history. And how do we date the rigwither based on this? Around seven thousand b c, or maybe six thousand b c. Whatever you all it about six or seven thousand years before today.