SOURCE

                 var date=new Date()
 var year=date.getFullYear();
    var day=date.getDate();
    var month=date.getMonth();
 var k=date.getTime();

var date1=new Date(year,month,day)
var data2=new Date(year,month+1,day)
 
console.log(date1,date2)
console.log((date2.getTime()-date1.getTime())/(1000*60*60*24))