forms - JavaScript which calculates the number of days by today, from user selected date -


i have code bellow provides user selected date. want calculate how many days have been gone today , result that: "today's 2541st /example/ day of blablabla...". want result returned, wherever want. i'm novice in javascript, please explain me how done idea. in advance.

function incrementday(month,year) { var lastday = new date(year, month, 0).getdate(); var nday=document.getelementbyid("bday").value; ++nday; if (nday > lastday) {     nday =1 } document.getelementbyid("bday").value=nday; }  function incrementmonth() { var nmonth = document.getelementbyid("bmonth").value; ++nmonth; if (nmonth==13) {     nmonth =1 } document.getelementbyid("bmonth").value=nmonth; } </script>  <head> </head> <body>  <input type="button" value="0" id="bday" onclick="javascript:incrementday(document.getelementbyid('bmonth').value, document.getelementbyid('byear').value);" /> <input type="button" value="0" id="bmonth" onclick="javascript:incrementmonth();" /> <input type="text" value="0" id="byear" />  <script language="javascript"> var cdate= new date(); var cday = cdate.getdate(); var cmonth = cdate.getmonth(); var cyear = cdate.getfullyear();  ++cmonth;  document.getelementbyid("bday").value=cday; document.getelementbyid("bmonth").value=cmonth; document.getelementbyid("byear").value=cyear;  </script>  </body> </html>


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