Calculate the difference in days between dates

DateDiff: function (sDate1, sDate2){     // sDate1 and sDate2 are in 2018-05-02 format   
           var   aDate, oDate1, oDate2, iDays  
           aDate  =  sDate1.split("-")  
           oDate1   =   new   Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])     // Convert to 02-05-2018 format   
           aDate = sDate2.split("-" )  
           oDate2   =   new   Date (aDate [1] + '-' + aDate [2] + '-' + aDate [0 ])  
           iDays   = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 /24) //Convert the difference in milliseconds to days  
            return   iDays  
        },