如何使用Dart格式化日期？ [英] How do I format a date with Dart?

问题描述

我有一个 DateTime 的实例，我想把它格式化为一个字符串。我怎么做？我想把日期变成一个字符串，例如2013-04-20。

I have an instance of DateTime and I would like to format that to a String. How do I do that? I want to turn the date into a string, something like "2013-04-20".

谢谢！

推荐答案

您可以使用

You can use the intl package to format dates.

对于 en_US 格式，很简单：

import 'package:intl/intl.dart';

main() {
  var now = new DateTime.now();
  var formatter = new DateFormat('yyyy-MM-dd');
  String formatted = formatter.format(now);
  print(formatted); // something like 2013-04-20
}

有很多格式化选项。从文档：

There are many options for formatting. From the docs:

 ICU Name                   Skeleton
 --------                   --------
 DAY                          d
 ABBR_WEEKDAY                 E
 WEEKDAY                      EEEE
 ABBR_STANDALONE_MONTH        LLL
 STANDALONE_MONTH             LLLL
 NUM_MONTH                    M
 NUM_MONTH_DAY                Md
 NUM_MONTH_WEEKDAY_DAY        MEd
 ABBR_MONTH                   MMM
 ABBR_MONTH_DAY               MMMd
 ABBR_MONTH_WEEKDAY_DAY       MMMEd
 MONTH                        MMMM
 MONTH_DAY                    MMMMd
 MONTH_WEEKDAY_DAY            MMMMEEEEd
 ABBR_QUARTER                 QQQ
 QUARTER                      QQQQ
 YEAR                         y
 YEAR_NUM_MONTH               yM
 YEAR_NUM_MONTH_DAY           yMd
 YEAR_NUM_MONTH_WEEKDAY_DAY   yMEd
 YEAR_ABBR_MONTH              yMMM
 YEAR_ABBR_MONTH_DAY          yMMMd
 YEAR_ABBR_MONTH_WEEKDAY_DAY  yMMMEd
 YEAR_MONTH                   yMMMM
 YEAR_MONTH_DAY               yMMMMd
 YEAR_MONTH_WEEKDAY_DAY       yMMMMEEEEd
 YEAR_ABBR_QUARTER            yQQQ
 YEAR_QUARTER                 yQQQQ
 HOUR24                       H
 HOUR24_MINUTE                Hm
 HOUR24_MINUTE_SECOND         Hms
 HOUR                         j
 HOUR_MINUTE                  jm
 HOUR_MINUTE_SECOND           jms
 HOUR_MINUTE_GENERIC_TZ       jmv
 HOUR_MINUTE_TZ               jmz
 HOUR_GENERIC_TZ              jv
 HOUR_TZ                      jz
 MINUTE                       m
 MINUTE_SECOND                ms
 SECOND                       s

对于非en_US日期，需要显式加载语言环境。请参见 http://api.dartlang.org/docs/releases/latest/intl/DateFormat.html 了解详情。

For non-en_US dates, you need to explicitly load in the locale. See http://api.dartlang.org/docs/releases/latest/intl/DateFormat.html for more info.

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