这就给你提供了社交网络中的日期:[“今天”，“昨天”，“星期的哪一天”，等等。]

void main() {
      DateTime now = new DateTime(2018,6,26);
      print(date(now));
    }
    
    String date(DateTime tm) {
      DateTime today = new DateTime.now();
      Duration oneDay = new Duration(days: 1);
      Duration twoDay = new Duration(days: 2);
      Duration oneWeek = new Duration(days: 7);
      String month;
      switch (tm.month) {
        case 1:
          month = "january";
          break;
        case 2:
          month = "february";
          break;
        case 3:
          month = "march";
          break;
        case 4:
          month = "april";
          break;
        case 5:
          month = "may";
          break;
        case 6:
          month = "june";
          break;
        case 7:
          month = "july";
          break;
        case 8:
          month = "august";
          break;
        case 9:
          month = "september";
          break;
        case 10:
          month = "october";
          break;
        case 11:
          month = "november";
          break;
        case 12:
          month = "december";
          break;
      }
    
      Duration difference = today.difference(tm);
    
      if (difference.compareTo(oneDay) < 1) {
        return "today";
      } else if (difference.compareTo(twoDay) < 1) {
        return "yesterday";
      } else if (difference.compareTo(oneWeek) < 1) {
        switch (tm.weekday) {
          case 1:
            return "monday";
          case 2:
            return "tuesday";
          case 3:
            return "wednesday";
          case 4:
            return "thursday";
          case 5:
            return "friday";
          case 6:
            return "saturday";
          case 7:
            return "sunday";
        }
      } else if (tm.year == today.year) {
        return '${tm.day} $month';
      } else {
        return '${tm.day} $month ${tm.year}';
      }
    }

用“H:mm”来查看完整的分钟，比如13:08，而不是13:8

import 'package:intl/intl.dart';

main() {
  var formattedDate = new DateTime.Format('yyyy-MM-dd').DateTime.now();
  print(formattedDate); // something like 2020-04-16
}

有关更多详细信息，请参阅DateFormat文档

如果有人想将字符串格式的日期转换为其他字符串格式，首先使用DateTime.parse("2019-09-30")，然后将其传递给DateFormat("date pattern").format()

dateFormate = DateFormat("dd-MM-yyyy").format(DateTime.parse("2019-09-30"));

参考:Dart -如何将简单的日期字符串格式从yyyy-MM-dd更改为dd-MM-yyyy

有一个包date_format

dependencies:
    date_format:

code

import 'package:date_format/date_format.dart';

final formattedStr = formatDate(
    yourDateTime, [dd, '.', mm, '.', yy, ' ', HH, ':', nn]);

// output example "29.03.19 07:00"

注意:分钟是nn

链接到软件包

 String dateConverter(String date) {
    // Input date Format
    final format = DateFormat("dd-MM-yyyy");
    DateTime gettingDate = format.parse(date);
    final DateFormat formatter = DateFormat('yyyy-MM-dd');
    // Output Date Format
    final String formatted = formatter.format(gettingDate);
    return date;
  }