Replace into Array - Javascript -


i have , array of arrays this. 

var myarray = [                 [sun jul 24 2016 17:00:00 gmt-0500 (cot), '2', 'text text'],                 [sun jul 12 2016 17:00:00 gmt-0500 (cot), '3', 'text text'],                 [mon jul 07 2016 17:00:00 gmt-0500 (cot), '4', 'text text'],                 [sun jul 01 2016 17:00:00 gmt-0500 (cot), '1', 'text text'],                 [sun jan 01 2016 17:00:00 gmt-0500 (cot), '2', 'text text'],                 [sun jan 02 2016 17:00:00 gmt-0500 (cot), '1', 'text text'],               ];

so, want change items of these array according dates this: 

var myarray = [              [sun jul 24 2016 17:00:00 gmt-0500 (cot), '4', 'text text'],              [sun jul 12 2016 17:00:00 gmt-0500 (cot), '3', 'text text'],              [mon jul 07 2016 17:00:00 gmt-0500 (cot), '2', 'text text'],              [sun jul 01 2016 17:00:00 gmt-0500 (cot), '1', 'text text'],              [sun jan 01 2016 17:00:00 gmt-0500 (cot), '1', 'text text'],              [sun jan 02 2016 17:00:00 gmt-0500 (cot), '2', 'text text'],                       ];

thanks in advance.

edit:

what's logic of these?: ok, it's replace items setting position of array main array.

for example. if day starting month number lower 1 or 2 , increase if day of month increse.

jan 1 1 in second item.

jan 2 2

jan 20 3

replace number items.

var previous_month, position, myarray = [    [new date("sun jan 02 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text'],    [new date("mon jul 07 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text'],    [new date("sun jul 24 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text'],    [new date("sun jan 01 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text'],    [new date("sun jul 12 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text'],    [new date("sun jul 01 2016 17:00:00 gmt-0500 (cot)"), 'x', 'text text']  ];    // sort items according dates in descending order  myarray.sort(function(a,b){    return a[0] < b[0] ? 1 : (a[0] > b[0] ? -1 : 0);  });    // each item  for(var i=myarray.length-1; i>=0; i--){    var item = myarray[i],        // year-month combination        month = item[0].getfullyear() + '-' + item[0].getmonth();    // if same encountered 1    if(month == previous_month){      // increase position      position++;    } else {      // otherwise, reset      position = 1;      // update previous_month      previous_month = month;    }    // insert (converted string)    item[1] = '' + position;  }    console.log(myarray);


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