jquery - nvd3 linebar chart xAxis date format -

i have working line , bar chart having problems getting date format appropriately on xaxis. did around couldn't find linebar chart examples out there used same date format need.

here json stored variable looks like:

var data = [{         "key": "cases",         "bar": true,         "color": "skyblue",         "values": [             [2016-01-01, 13],             [2016-01-02, 17],             [2016-01-03, 19],             [2016-01-04, 39],             [2016-01-05, 46],             [2016-01-06, 34],             [2016-01-07, 36],             [2016-01-08, 32]         ]     },      {         "key": "csat",         "color": "steelblue",         "values": [             [2016-01-01, 9],             [2016-01-02, 7],             [2016-01-03, 10],             [2016-01-04, 10],             [2016-01-05, 8],             [2016-01-06, 9],             [2016-01-07, 10],             [2016-01-08, 10]         ]     } ]; 

i believe part of code needs review:

    chart.xaxis.showmaxmin(true)         .tickformat(function (d) {         var dx = data[0].values[d] && data[0].values[d][0] || 0;         return d3.time.format('%y-%d-%m')(new date(dx));     }); 

this code written date in epoch/unix format, however, json has different format date - looks 2016-01-01 %y-%d-%m.

you can view whole chart code here: http://jsfiddle.net/pty79q2z/

thanks in advance!