飞镖日期倒计时

首先-存在错误：您必须使用

data.remaining.inMilliseconds

data.remaining.inSeconds

对于格式化，最好使用Duration而不是DateTime。但是您可以更改现有代码，例如：

var format = new DateFormat("mm:ss");var dateString = '${data.remaining.inHours}:${format.format(DateTime.fromMillisecondsSinceEpoch(data.remaining.inMilliseconds))};print(dateString);

UPD 小工具，用于显示剩余时间

int estimateTs = DateTime(2018, 11, 5, 7, 15, 30).millisecondsSinceEpoch; // set needed date....StreamBuilder(stream: Stream.periodic(Duration(seconds: 1), (i) => i),builder: (BuildContext context, AsyncSnapshot<int> snapshot) {  DateFormat format = DateFormat("mm:ss");  int now = DateTime      .now()      .millisecondsSinceEpoch;  Duration remaining = Duration(milliseconds: estimateTs - now);  var dateString = '${remaining.inHours}:${format.format(      DateTime.fromMillisecondsSinceEpoch(remaining.inMilliseconds))}';  print(dateString);  return Container(color: Colors.greenAccent.withOpacity(0.3),    alignment: Alignment.center,    child: Text(dateString),);});