Petrol And Diesel Rates: State-run oil marking companies such as Indian Oil Corporation currently review the petrol and diesel prices on a daily basis, and implement any revisions at fuel stations with effect from 6 am.
Source

Petrol And Diesel Rates: State-run oil marking companies such as Indian Oil Corporation currently review the petrol and diesel prices on a daily basis, and implement any revisions at fuel stations with effect from 6 am.
Source