以正确的格式显示日期

我有这样的字符串。我们如何以正确的格式显示日期？现在它像这样显示："测试日期"："/日期（1468783153887）/"。我在 jquery 函数中分配字符串值：

    [{"RowIndex":1,"ObjectId":600290,"SpaceId":null,"Xposition":null,"Yposition":null,"Angle":null,"DrawingId":18137,"BlockRefHandle":"3DE","ObjectClassId":9387,"SymbolId":null,"ScaleFactor":null,"SymbolColor":120,"IsBlockBased":true,"NumberWithClassName":"DR-1040318 (Doors)","ObjectNo":"DR-1040318","ObjectClassName":"Doors","Equipment":"Doors","Address":"123:7yt","NFPA Classification":null,"Health Classification":null,"Test Method":"Functional","Test Result":"Passed","Test Date":"'/Date(1468783153887)'/","Dev. Reading":null,"Dev. Reading Date":"'/Date(1468783153887)'/","Barcode":null,"Site":"4433-75006-00045","Building":"Building Test","Floor":"Floor Test","Status":"Assigned","Attachments":"None","sfde":null,"Attribute for test - not mand":null,"Attribute for test":null,"Test Attribute":null,"intsi":null,"uiiiiiii":null,"Note":null,"s667":null,"sg":null,"ui":null,"My Attribute":null,"Comment":null,"Comments":null,"Location":null,"test12":null,"abcd":null,"Activate1":null,"Activating":null,"Activating Device Address":null,"Activating Device Location":null,"Shutdown Device Type":null,"Test2":null,"vvvd":null}]

功能

   function toolTipFulldata(i, columnAlias) {// building contents to tooltip
    var html = '';//'<table border="1">';
    $.each(dataForToolTip[i], function (key, value) {
            for (var j = 0; j < columnAlias.length; j++) {
            if (key == columnAlias[j]) {
                if (value == null)                      
                    value = "";                                       
                html += '<span>' + key + '</span>';
                html += '<span style="color:blue;">' + ":" + value + '</span></br>';
            }
        }
              });
    $("#showTooltip").html(html);
};    

我们可以做任何事情来获取该字符串中正确格式的日期吗？