In which year the term Sadar-e-Riyasat was removed?

During partition, there was the post of Sadar-e-Riyasat in place of the post of the Governor. Dr Karan Singh was the first Sadar-e-Riyasat from 20^th June, 1949 to 30^th March, 1965. The term ‘Governor’ came after the 6^th Amendment and Dr Karan Singh became the first Governor of Jammu and Kashmir with effect from 30^th March, 1965.