title: CanvasJs not formatting date properly
body: <p>I want to display the number of patient diagnosed by cancer and from that I get my JSON data right.  The problem is no matter what I do, it plots as date 1970 when the actual date is differen.<br>
  further more having checked that; when I include "JSON_NUMERIC_CHECK" on the PHP returned JSON, then will display the the Y-axis correctly and if I remove it will display the date correctly. </p>
  
  <p>here is my JSON data </p>
  
  <pre><code>[
      {
          "y": 2,
          "x": 2004
      }
  ]
  </code></pre>
  
  <p>and here is my code </p>
  
  <pre><code>if(json.length !=0){
                  //alert(json);
                      alert(json[0].x);
  
  
                      var dp1 = [];   
                      for(var i=0; i&lt;json.length; i++){
  
                          dp1.push({x:new Date(json[i].x), y:json[i].y})
                      }
  
                              $("#dchart").CanvasJSChart({ //Pass chart options
                                  title:{text:"Cancer Diagnosis Number "},
                                   zoomEnabled: true,
                                    panEnabled: true, 
                                      axisX:{valueFormatString:"YYYY",labelAngle:-45},
  
                                      data: [{
                                          color:"red",
                                          type: "column",
                                          legendText:"Thyroid Cancer",    
                                          showInLegend:true,
                                          dataPoints:dp1
  
                                          }]}); 
  </code></pre>