一个更简单的方法:

new DateFormat("dd-MM-y").format(YOUR_DATETIME_HERE)

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}';
      }
    }

由于flutter常用的Datetime库不知道德国的区域设置——de、de、de_DE、de- de或任何其他组合都不知道，例如，如果您希望用人类可读的字符串编写月份名称或日期名称，我建议您使用以下代码。

安装pub flutter pub add date_format

String formattedDate = formatDate(DateTime(year, month, day),[dd,'. ', MM, ' ', yyyy], locale: GermanDateLocale());

可以使用intl包格式化flutter中的日期。

void main() {
  final DateTime now = DateTime.now();
  final DateFormat format = DateFormat('yyyy-MM-dd');
  final String formatted = format.format(now);
  // 2021-03-02
}

或者可以使用date_format包来格式化flutter中的日期。

import 'package:date_format/date_format.dart';

final formattedStr = formatDate(DateTime.now(), [dd, '-', mm, '-', yyyy]);

//02-03-2021

这也会起作用:

DateTime today = new DateTime.now();
String dateSlug ="${today.year.toString()}-${today.month.toString().padLeft(2,'0')}-${today.day.toString().padLeft(2,'0')}";
print(dateSlug);

如果你想将多个日期格式合并为一个，这就是我们使用intl的方法。

DateFormat('yMMMd').addPattern(DateFormat.HOUR24_MINUTE).format(yourDateTime))