EasyUI DataGrid 时间格式化、字符串长度截取

<table id="tbList" style="height: 340px;" striped="true" rownumbers="true"  iconcls="icon-edit" nowrap="false"  idfield="Id" url="@Url.Action("ListData")">
　　<tr>
　　　　 <th field="Date" formatter="Common.DateFormatter" width="80">
                    日期
        </th>
        <th field="Date" formatter="Common.TitleFormatter" width="100">
                    标题 
       </th>
　　</tr>
</table>

var Common = {

    //EasyUI用DataGrid用日期格式化
    TimeFormatter: function (value, rec, index) {
        if (value == undefined) {
            return "";
        }
        /*json格式时间转js时间格式*/
        value = value.substr(1, value.length - 2);
        var obj = eval('(' + "{Date: new " + value + "}" + ')');
        var dateValue = obj["Date"];
        if (dateValue.getFullYear() < 1900) {
            return "";
        }
        var val = dateValue.format("yyyy-mm-dd HH:MM");
        return val.substr(11, 5);
    },
    DateTimeFormatter: function (value, rec, index) {
        if (value == undefined) {
            return "";
        }
        /*json格式时间转js时间格式*/
        value = value.substr(1, value.length - 2);
        var obj = eval('(' + "{Date: new " + value + "}" + ')');
        var dateValue = obj["Date"];
        if (dateValue.getFullYear() < 1900) {
            return "";
        }

        return dateValue.format("yyyy-mm-dd HH:MM");
    },

    //EasyUI用DataGrid用日期格式化
    DateFormatter: function (value, rec, index) {
        if (value == undefined) {
            return "";
        }
        /*json格式时间转js时间格式*/
        value = value.substr(1, value.length - 2);
        var obj = eval('(' + "{Date: new " + value + "}" + ')');
        var dateValue = obj["Date"];
        if (dateValue.getFullYear() < 1900) {
            return "";
        }

        return dateValue.format("yyyy-mm-dd");
    },
    TitleFormatter : function (value, rec, index) {
        if (value.length > 10) value = value.substr(0, 8) + "...";
        return value;
    },
    LongTitleFormatter: function (value, rec, index) {
        if (value.length > 15) value = value.substr(0, 12) + "...";
        return value;
    }
};