const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*millisecondsconst firstDate = new Date(2008, 1, 12);const secondDate = new Date(2008, 1, 22);const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));

const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*millisecondsconst firstDate = new Date(2008, 1, 12);const secondDate = new Date(2008, 1, 22);const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));