Finding Difference between Dates in Javascript ( Yui Calendar ) -

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i have been working orangehrm project. uses yui calendar. have been working on leave module. leave module lets user choose , date - time frame wants apply leave !

i want show number of working days once user has chosen dates . simple subtract statement not work because want exclude saturdays , sundays equations since don't count working days ! 

function filltodate(frmleaveapp) {      var fromdate = frmleaveapp.elements['txtleavefromdate'];         var todate = frmleaveapp.elements['txtleavetodate'];             var result = frmleaveapp.elements['txtleavetotalday'];       if(!fromdate || !todate || !result) {         return;     }          var = fromdate.value;         var b = todate.value;          var c = a.split('-');         var d = b.split('-');          var ac = new date();         ac.setfullyear(c[2], c[1], c[0]);         var bd = new date();         bd.setfullyear(d[2], d[1], d[0]);          result.value = (bd.gettime() - ac.gettime()) / (60*60*24*1000); }

how do ? in advance !

not super proud of solution - must more elegant ways, should work - not handle national holidays yet

demo here

function filltodate(frmleaveapp) {      var fromdate = frmleaveapp.elements['txtleavefromdate'];     var todate = frmleaveapp.elements['txtleavetodate'];     var result = frmleaveapp.elements['txtleavetotalday'];      if(!fromdate || !todate || !result) {         return;     }      var = new date(fromdate.value.replace(/\-/g,"/"));     var = new date(todate.value.replace(/\-/g,"/"));      // brute force seems quickest find     var res = 0;     var aday = 24*60*60*1000;     (var = from.gettime(), n=to.gettime();i < n; i+=aday) {       var d = new date(i).getday();       if (d!=0 && d !=6) res++;     }     result.value = res; }

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