Do you know the difference between these two lines? var d1 = new Date("2015/06/17"); var d2 = new Date("2015-06-17"); How about these? var d1 = new Date("2015/06/17 00:00:00"); var d2 = new Date("2015-06-17 00:00:00"); Or these? var d1 = new Date("2015/06/