Now I ve checked the death date too 22nd January is Old Style as well The exact date of Shah Jahan s death is not in his own chronicle which I am translating but in that of his successor Alamgir Aurangzeb In the Ma sir i lamg r the author notes in the chapter on Aurangzeb s seventh year of reign i e 1076 of the Hijra Early in the night of Monday the 26th Rajab Shah Jahan succumbed to the disease and gave up the ghost S q Musta idd Kh n Ma sir i lamg r tr Jadunath Sarkar 2nd ed Delhi 1986 p 34 26th Rajab 1076 AH gives 1st February 1666 AD New Style and 22nd January 1666 AD Old Style Date calculations can be done easily with the Swiss Calendar Converter Greetings