Flutter 时间控件修改

String  selectItemValue=new DateTime.fromMillisecondsSinceEpoch(widget.birthday).toString().substring(0,10);

 FlatButton(
              onPressed: (){
                DateTime now= DateTime.parse("2000-01-01");
                DatePicker.showDatePicker(context,
                    showTitleActions: true,
                    minTime: DateTime(1950, 1, 1),
                    maxTime: DateTime(2020, 12,31), onChanged: (date) {
                      print('change $date');
                    }, onConfirm: (date) {
                      setState(() {
                        selectItemValue= '$date';
                      });
                      print('confirm $date');
                    },
                   //currentTime: DateTime.now(), locale: LocaleType.zh
                    currentTime:  DateTime.parse(selectItemValue), locale: LocaleType.zh //选择器上的时间为数据库读取的时间
           				// DateTime.parse() 将字符串类型的时间格式为时间类型
                );
              },
              //new DateTime.fromMicrosecondsSinceEpoch(listData[0]['birthday']).toString().substring(0,10)
              //listData[0]['birthday']==null?new DateTime.fromMicrosecondsSinceEpoch(listData[0]['birthday']).toString().substring(0,10):selectItemValue.toString().substring(0,10)
              child:
              selectItemValue==null?Container(
                  child:
                  Text('2000-01-01',style: TextStyle(color: Colors.black87,fontSize: 17),)//当没有选择的时候默认的值
              ):
              Container(
               // alignment: Alignment.centerRight,
                margin: EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 0.0),
                width: 160,

                child:
                Text(selectItemValue.substring(0,10),textAlign:TextAlign.right,style: TextStyle(fontSize: 17,fontWeight: FontWeight.w400,color: Colors.black87),),
              ),
            ),