Works ww=new Works();
 String dd  =CHECKTIME.substring(0,19);
		            	ww.setId(new GUID().getguid());
		            	ww.setGonghao(gonghao);
		            	SimpleDateFormat aa= new SimpleDateFormat("yyyy-MM-dd HH：mm：ss");
		            	Date ddate=aa.parse(dd);
					     ww.setWorkDate(ddate);
					     ww.setSort(VERIFYCODE);
					     ww.setDel("0");

报错

java.text.ParseException: Unparseable date: "2019-04-28 14:48:23"

怎么报错了呢 之前用过好使的啊