You need to use the Query Workbook endpoint in the rest API. It contains the created / updated date.
Alternatively, look into querying the underlying Postgres Tableau Repository database, it might be easier.
Thanks for the response.
We have Query Workbook Rest API for date attributes of Workbook but here we need for Projects and sites date attributes.
Is there any rest API for those?
Or else any other way to find those?
please help in finding those.
If the dates aren't returned on the Query Projects request on the API then there's no other way I know of to get them via the API. You would need to suggest this as an enhancement by creating a case with Tableau Support and/or adding it to the ideas library here - Ideas
As previously suggested, connecting to the Tableau Repository database might be a better idea.