Rep. Laura Black (D) of Sandy is sponsoring a bill (HB 242) that would change the date of the cutoff for Kindergarten from September to be in July. In a Salt Lake Tribune article (see here) about the bill, Rep. Black is quoted as saying, "It doesn't sound like very much when you're an adult, but two months in the life of a child can be huge in terms of what their development is."
I've got a better idea, let the parents of the child decide if their child is ready for Kindergarten. My wife and I have done this for everyone of our children. Our oldest child, whose birthday is in June, could have started Kindergarten the year he turned five. My wife and I decided he was not ready for Kindergarten that year and waited a year before enrolling him in Kindergarten. Do parents really need the government to tell them that their child is or isn't ready for Kindergarten?