JSP grid表格，时间格式转换

<div field="updateDate" id ="updateDate" name = "updateDate" width="100" headerAlign="center" align="center" renderer="ondayRenderer">更新时间</div>

		function ondayRenderer(e) {
			var value = e.value;
			if(value != null){
				value = new Date(value);
				if (value) return mini.formatDate(value, 'yyyy-MM-dd');
			}else{
				return "";
			}
		}