java判断时间格式

= value.matches("^\\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[1-2]\\d|3[0-1])T(?:[0-1]\\d|2[0-3]):[0-5]\\d:[0-5]\\d.\\d{3}\\+\\d{4}$");
                    if (is){
                        Date date = sdf1.parse(term.getValue().toString());
                        value = sdf.format(date);
                    }else{
                        value=term.getValue().toString();
                    }