jquery - Javascript, advancing date range -


i using date-picker set start , end date. date range supposed move forward each day 2 week, sliding window of entry.

my code below works refactor easier maintain. techniques or tools can use improve code?

var challenge_start = new date(2015,04,04); var challenge_end = new date(2015,06,12); var range_start; var range_end; var today = new date(); var dd = today.getdate(); var mm = today.getmonth()+1; //january 0! var yyyy = today.getfullyear(); if(today<challenge_start) {     range_start=challenge_start;     range_end=challenge_start; } else if(today>challenge_start && today<challenge_end) {     if(mm==5) {         if(dd<18) {             range_start=challenge_start;             range_end=today;         }         else {             range_start=today.setdate(today.getdate()-14);             range_end=today;                     }     }     else if(mm=6) {         if(dd<29) {             range_start=today.setdate(today.getdate()-14);             range_end=today;                         }         else {             range_start=today.setdate(today.getdate()-14);             range_end=challenge_end;                         }     }     else if(mm==7) {         if(dd<12) {             range_start=today.setdate(today.getdate()-14);             range_end=challenge_end;                         }         else {             range_start=challenge_end;             range_end=challenge_end;                         }     } } else if(today>challenge_end) {     range_start=challenge_end;     range_end=challenge_end;         }  $("#date").datepicker({     startdate: range_start,     enddate: range_end,     keyboardnavigation: false,     autoclose: true,     todayhighlight: true,     language: langdate,     disabletouchkeyboard: true });

i may not understand striving for, i'm pretty sure don't need have if(mm==x) , if(dd=x) statements.

perhaps want:

var challenge_start = new date(2015,04,04); var challenge_end = new date(2015,06,12);  function getdateplusdays(origdate, days) {     var date = new date(origdate.gettime());     date.setdate(date.getdate() + days);     return date; }  function getclosestdateinrange(startdate, enddate, date) {     return (date < startdate) ?  startdate             : ((date > enddate) ? enddate: date); }  var today = new date(); var range_start = getclosestdateinrange(challenge_start, challenge_end, getdateplusdays(today, -14)); var range_end = getclosestdateinrange(challenge_start, challenge_end, today);

jsfiddle


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