easyUi DataGrid 显示日期列,时间为空也可，的正常显示，及普通居中列情况

$('#tt').datagrid({
                url: '@Url.Content("~/kpi/FindList")',
                width: "auto",
                height: "auto",
                fitColumns: true,
                nowrap: false,
                pagination: true,
                pageNumber: 1,
                singleSelect: false,
                frozenColumns: [[{ field: 'ck', checkbox: true}]],
                columns: [[

普通列：

{ field: 'ProjectName', title: '项目名称', width: 120, align: 'center', styler: function (value, row, index) { return 'vertical-align:middle;'; } },

居中显示列：

{ field: 'Id', title: '任务号', align: 'center', width: 50, formatter: function (val, rec) {
                         return "<div class='hiddenFontGommom devicetypes_a_box' >" + rec.Id + "</div>";
                     }
                     },

时间显示列：

{ field: 'ImplementationBeginDate', title: '实施开始时间', align: 'center', width: 220, formatter: function (val, rec) {
                         var date = new Date(parseInt(rec.ImplementationBeginDate.substr(6)));
                         var dateTime = date.getFullYear() + "-" + ((date.getMonth() + 1).toString().length > 1 ? (date.getMonth() + 1) : "0" + (date.getMonth() + 1)) + "-" + (date.getDate().toString().length > 1 ? date.getDate() : ("0" + date.getDate()))
                     + "&nbsp;" + (date.getHours().toString().length > 1 ? date.getHours() : ("0" + date.getHours())) + ":" + (date.getMinutes().toString().length > 1 ? date.getMinutes() : ("0" + date.getMinutes())) + ":" + (date.getSeconds().toString().length > 1 ? date.getSeconds() : ("0" + date.getSeconds()));
                         return "<div class='hiddenFontGommom devicetypes_a_box' title=" + dateTime.replace(/ /g, "&nbsp;") + ">" + dateTime + "</div>";
                     }
                     },

有时间为空的特殊时间显示列：

{ field: 'ImplementationEndDate', title: '实际完成时间', align: 'center', width: 220, formatter: function (val, rec) {
                         if (rec.ImplementationEndDate == null || rec.ImplementationEndDate == '') {
                             return "<div class='hiddenFontGommom devicetypes_a_box' ></div>";
                         }
                         else {
                             var date = new Date(parseInt(rec.ImplementationEndDate.substr(6)));
                             var dateTime = date.getFullYear() + "-" + ((date.getMonth() + 1).toString().length > 1 ? (date.getMonth() + 1) : "0" + (date.getMonth() + 1)) + "-" + (date.getDate().toString().length > 1 ? date.getDate() : ("0" + date.getDate()))
                     + "&nbsp;" + (date.getHours().toString().length > 1 ? date.getHours() : ("0" + date.getHours())) + ":" + (date.getMinutes().toString().length > 1 ? date.getMinutes() : ("0" + date.getMinutes())) + ":" + (date.getSeconds().toString().length > 1 ? date.getSeconds() : ("0" + date.getSeconds()));

return "<div class='hiddenFontGommom devicetypes_a_box' title=" + dateTime.replace(/ /g, "&nbsp;") + ">" + dateTime + "</div>";
                         }
                     }
                     },

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