I think for every Maharashtrian Chatrapati Shjivaji Maharaj is the God. We celebrate Ram Navmi, ganesh Jayanti on perticular 'Tithi' ( by Marathi Calender) just because of they are God. But we did't celebrate Gandhi jayanti or Dr. Babasaheb Ambedkar jayanti by Tithi because the are Great Peoples and not Gods.
So In my term it's a subject of everyones mind. some says Maharaj is God and some says he is Great person so its upon them to celebrate Shivjayanti on Tithi ( by Marathi Calender) or By Date ( English Calender)