<script> function getDays(strDateStart,strDateEnd){ var strSeparator = "-"; var oDate1; var oDate2; var iDays; oDate1= strDateStart.split(strSeparator); oDate2= strDateEnd.split(strSeparator); var strDateS = new Date(oDate1[0], oDate1[1]-1, oDate1[2]); var strDateE = new Date(oDate2[0], oDate2[1]-1, oDate2[2]); iDays = parseInt(Math.abs(strDateS - strDateE ) / (1000*24*3600)) return iDays ; } alert(getDays('2014-02-26','2014-08-18')) </script>