JavaScript on Chrome and Firefox will accept days up to 31, regardless of month--'9/31/2019' will be October 1. On the other hand, IE 11 really doesn't care how

JavaScript on Chrome and Firefox will accept days up to 31, regardless of month--'9/31/2019' will be October 1. On the other hand, IE 11 really doesn't care how big the day is--100, 1000, it's all good. "new Date('6/1000/2019') is Feb 24 2022 as far as IE 11 is concerned.