Flutter 日期轉換

DateTime now = DateTime.now();
          DateTime time = DateTime.parse('2018-12-31');
          if (now.isBefore(time)) {
            Duration duration = time.difference(now);
print(duration.inDays.toString());

          }

Dart中,日期可通過isAfter或者isBefore判斷日期的先後,通過difference()方法比較兩個日期之間的差值