entityMap|blocks|key|furqm|text|您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1aodr|包(|72l85|安装程序|ctaka|)格式化日期。|a7s3c|对于|3l9ns|格式，这很简单：|8kisu|import+'package:intl/intl.dart';

main()+{
++final+DateTime+now+=+DateTime.now();
++final+DateFormat+formatter+=+DateFormat('yyyy-MM-dd');
++final+String+formatted+=+formatter.format(now);
++print(formatted);+//+something+like+2013-04-20
}|code-block|syntax|javascript|3kfmv|格式有很多选项。从文档中：|8vu29|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|8u2j7|对于非-|4dkhp|日期，则需要在区域设置中显式加载。请参阅|ep2ao|文档|839m6|了解更多信息。The+The+The|2dhs0|包含每个国家/地区/语言的所有格式，如果您想深入了解的话。^0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|15|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|16|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|17|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|18|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|19|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|1A|9|@]|A|@]|B|$]]|$2|M|4|N|6|O|8|1B|9|@]|A|@]|B|$P|Q]]|$2|R|4|S|6|7|8|1C|9|@]|A|@]|B|$]]|$2|T|4|U|6|O|8|1D|9|@]|A|@]|B|$P|Q]]|$2|V|4|W|6|7|8|1E|9|@]|A|@]|B|$]]|$2|X|4|Y|6|7|8|1F|9|@]|A|@]|B|$]]|$2|Z|4|10|6|7|8|1G|9|@]|A|@]|B|$]]|$2|11|4|12|6|7|8|1H|9|@]|A|@]|B|$]]|$2|13|4|14|6|7|8|1I|9|@]|A|@]|B|$]]]]

You can use the <a href="https://www.dartdocs.org/documentation/intl/latest/intl/DateFormat-class.html" rel="noreferrer"><code>intl</code></a> package (<a href="https://pub.dev/packages/intl/install" rel="noreferrer">installer</a>) to format dates.
For <code>en_US</code> formats, it's quite simple:
<pre class="lang-dart prettyprint-override"><code>import 'package:intl/intl.dart';

main() {
 final DateTime now = DateTime.now();
 final DateFormat formatter = DateFormat('yyyy-MM-dd');
 final String formatted = formatter.format(now);
 print(formatted); // something like 2013-04-20
}
</code></pre>
There are many options for formatting. From the docs:
<pre><code>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
</code></pre>
For non-<code>en_US</code> dates, you need to explicitly load in the locale. See the <a href="https://www.dartdocs.org/documentation/intl/latest/intl/DateFormat-class.html" rel="noreferrer"><code>DateFormat</code> docs</a> for more info. The <a href="https://github.com/dart-lang/intl/blob/master/lib/date_symbol_data_local.dart" rel="noreferrer"><code>date_symbol_data_local.dart</code></a> contains all of the formats for each country/language, if you would like a more in-depth look.

entityMap|blocks|key|81kgq|text|这也是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|a439c|DateTime+today+=+new+DateTime.now();
String+dateSlug+="${today.year.toString()}-${today.month.toString().padLeft(2,'0')}-${today.day.toString().padLeft(2,'0')}";
print(dateSlug);|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

This will work too:



<pre class="lang-dart prettyprint-override"><code>DateTime today = new DateTime.now();
String dateSlug ="${today.year.toString()}-${today.month.toString().padLeft(2,'0')}-${today.day.toString().padLeft(2,'0')}";
print(dateSlug);
</code></pre>

entityMap|blocks|key|6fg5k|text|这给出了类似于社交网络中的日期：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|eapdo|“今天”、“昨天”、“星期几”等。|ffe0a|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}';
++++++}
++++}|code-block|syntax|javascript^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|K|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|L|9|@]|A|@]|B|$H|I]]]]

This give you the date like in a social network : [&quot;today&quot;,&quot;yesterday&quot;,&quot;dayoftheweek&quot;,etc..]
<pre><code>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 = &quot;january&quot;;
 break;
 case 2:
 month = &quot;february&quot;;
 break;
 case 3:
 month = &quot;march&quot;;
 break;
 case 4:
 month = &quot;april&quot;;
 break;
 case 5:
 month = &quot;may&quot;;
 break;
 case 6:
 month = &quot;june&quot;;
 break;
 case 7:
 month = &quot;july&quot;;
 break;
 case 8:
 month = &quot;august&quot;;
 break;
 case 9:
 month = &quot;september&quot;;
 break;
 case 10:
 month = &quot;october&quot;;
 break;
 case 11:
 month = &quot;november&quot;;
 break;
 case 12:
 month = &quot;december&quot;;
 break;
 }
 
 Duration difference = today.difference(tm);
 
 if (difference.compareTo(oneDay) &lt; 1) {
 return &quot;today&quot;;
 } else if (difference.compareTo(twoDay) &lt; 1) {
 return &quot;yesterday&quot;;
 } else if (difference.compareTo(oneWeek) &lt; 1) {
 switch (tm.weekday) {
 case 1:
 return &quot;monday&quot;;
 case 2:
 return &quot;tuesday&quot;;
 case 3:
 return &quot;wednesday&quot;;
 case 4:
 return &quot;thursday&quot;;
 case 5:
 return &quot;friday&quot;;
 case 6:
 return &quot;saturday&quot;;
 case 7:
 return &quot;sunday&quot;;
 }
 } else if (tm.year == today.year) {
 return '${tm.day} $month';
 } else {
 return '${tm.day} $month ${tm.year}';
 }
 }
</code></pre>

entityMap|blocks|key|fmjui|text|您还可以指定如前所述的日期格式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5r9l9|https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html|2p9ul|import+'package:intl/intl.dart';
String+formatDate(DateTime+date)+=>+new+DateFormat("MMMM+d").format(date);|code-block|syntax|javascript|68p9u|产生：^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|M|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|N|9|@]|A|@]|B|$H|I]]|$2|J|4|K|6|7|8|O|9|@]|A|@]|B|$]]]]

You can also specify the date format like stated earlier: <a href="https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html" rel="noreferrer">https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html</a>
<pre><code>import 'package:intl/intl.dart';
String formatDate(DateTime date) =&gt; new DateFormat(&quot;MMMM d&quot;).format(date);
</code></pre>
Produces: <code>March 4</code>

entityMap|blocks|key|bf3s5|text|有包裹日期|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8t08i|_|3krgp|格式|fn6vk|dependencies:
++++date_format:|code-block|syntax|javascript|6aaug|代码|76th8|import+'package:date_format/date_format.dart';

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

//+output+example+"29.03.19+07:00"|9k8jn|注意:分钟是|10ulh|神经网络|2n4pe|链接到包^0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|V|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|W|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|X|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|Y|9|@]|A|@]|B|$J|K]]|$2|L|4|M|6|7|8|Z|9|@]|A|@]|B|$]]|$2|N|4|O|6|I|8|10|9|@]|A|@]|B|$J|K]]|$2|P|4|Q|6|7|8|11|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|12|9|@]|A|@]|B|$]]|$2|T|4|U|6|7|8|13|9|@]|A|@]|B|$]]]]

There is a package date_format

<pre><code>dependencies:
 date_format:
</code></pre>

code

<pre><code>import 'package:date_format/date_format.dart';

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

// output example "29.03.19 07:00"
</code></pre>

Pay attention: minutes are nn

<a href="https://pub.dartlang.org/packages/date_format#-readme-tab-" rel="noreferrer">link to the package</a>

entityMap|blocks|key|3hu0h|text|如果有人想要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()，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|flib7|dateFormate+=+DateFormat("dd-MM-yyyy").format(DateTime.parse("2019-09-30"));|code-block|syntax|javascript|ig51|参考资料：|720qd|647d9|Dart+-如何将yyyy-MM-dd中的简单日期字符串的格式更改为dd-MM-yyyy^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|N|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|O|9|@]|A|@]|B|$]]|$2|J|4|-4|6|7|8|P|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|Q|9|@]|A|@]|B|$]]]]

If someone wants to convert a date in string format to some other string format first use DateTime.parse("2019-09-30") then pass it to DateFormat("date pattern").format() like 

<pre><code>dateFormate = DateFormat("dd-MM-yyyy").format(DateTime.parse("2019-09-30"));
</code></pre>

Reference: <a href="https://stackoverflow.com/questions/58040606/dart-how-to-change-format-of-simple-date-string-which-is-in-yyyy-mm-dd-to-dd-m#answer-58042809">Dart - How to change format of simple date string which is in yyyy-MM-dd to dd-MM-yyyy</a>

entityMap|blocks|key|bqkcv|text|import+'package:intl/intl.dart';

main()+{
++var+formattedDate+=+new+DateTime.Format('yyyy-MM-dd').DateTime.now();
++print(formattedDate);+//+something+like+2020-04-16
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5cqps|有关更多详细信息，请参阅|unstyled|c9gu8|DateFormat文档^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$C|D]]|$2|E|4|F|6|G|8|K|9|@]|A|@]|B|$]]|$2|H|4|I|6|G|8|L|9|@]|A|@]|B|$]]]]

<pre><code>import 'package:intl/intl.dart';

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

For more details can refer <a href="https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html" rel="nofollow noreferrer">DateFormat Documentation</a>

entityMap|blocks|key|8a350|text|pubspec.yaml：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8tu8a|dependencies:
++intl:|code-block|syntax|javascript|757r8|main.dart：|elq5f|import+'package:intl/intl.dart';+//+for+date+format
import+'package:intl/date_symbol_data_local.dart';+//+for+other+locales

void+main()+{
++var+now+=+DateTime.now();
++print(DateFormat().format(now));+//+This+will+return+date+using+the+default+locale
++print(DateFormat('yyyy-MM-dd+hh:mm:ss').format(now));
++print(DateFormat.yMMMMd().format(now));+//+print+long+date+
++print(DateFormat.yMd().format(now));+//+print+short+date+
++print(DateFormat.jms().format(now));+//+print+time+

++initializeDateFormatting('es');+//+This+will+initialize+Spanish+locale
++print(DateFormat.yMMMMd('es').format(now));+//+print+long+date+in+Spanish+format
++print(DateFormat.yMd('es').format(now));+//+print+short+date+in+Spanish+format
++print(DateFormat.jms('es').format(now));+//+print+time+in+Spanish+format
}|4p016|结果：|1bknh|May+31,+2020+5:41:42+PM
2020-05-31+05:41:42
May+31,+2020
5/31/2020
5:41:42+PM
31+de+mayo+de+2020
31/5/2020
17:41:42^0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|P|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|Q|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|R|9|@]|A|@]|B|$]]|$2|J|4|K|6|E|8|S|9|@]|A|@]|B|$F|G]]|$2|L|4|M|6|7|8|T|9|@]|A|@]|B|$]]|$2|N|4|O|6|E|8|U|9|@]|A|@]|B|$F|G]]]]

pubspec.yaml:

<pre><code>dependencies:
 intl:
</code></pre>

main.dart:

<pre><code>import 'package:intl/intl.dart'; // for date format
import 'package:intl/date_symbol_data_local.dart'; // for other locales

void main() {
 var now = DateTime.now();
 print(DateFormat().format(now)); // This will return date using the default locale
 print(DateFormat('yyyy-MM-dd hh:mm:ss').format(now));
 print(DateFormat.yMMMMd().format(now)); // print long date 
 print(DateFormat.yMd().format(now)); // print short date 
 print(DateFormat.jms().format(now)); // print time 

 initializeDateFormatting('es'); // This will initialize Spanish locale
 print(DateFormat.yMMMMd('es').format(now)); // print long date in Spanish format
 print(DateFormat.yMd('es').format(now)); // print short date in Spanish format
 print(DateFormat.jms('es').format(now)); // print time in Spanish format
}
</code></pre>

Result:

<pre><code>May 31, 2020 5:41:42 PM
2020-05-31 05:41:42
May 31, 2020
5/31/2020
5:41:42 PM
31 de mayo de 2020
31/5/2020
17:41:42
</code></pre>

entityMap|blocks|key|6nat4|text|如果您想要将几种日期格式合并为一种格式，则可以使用以下方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4tf9j|..。|7djdh|DateFormat('yMMMd').addPattern(DateFormat.HOUR24_MINUTE).format(yourDateTime))|code-block|syntax|javascript^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|K|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|L|9|@]|A|@]|B|$H|I]]]]

In the case you want to combine several date format into one, this is how we can do using <code>intl</code>.
<pre><code>DateFormat('yMMMd').addPattern(DateFormat.HOUR24_MINUTE).format(yourDateTime))
</code></pre>

entityMap|blocks|key|b0jup|text|处理每年的季度，从字符串到DateTime，我没有找到合适的解决方案，所以我做了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2nrpt|List+dateAsList+=+'Q1+2001'.split('+');
++++DateTime+dateTime+=+DateTime.now();
++++String+quarter+=+dateAsList[0];
++++int+year+=+int.parse(dateAsList[1]);
++++switch(quarter)+{
++++++case+"Q1":+dateTime+=+DateTime(year,+1);
++++++break;
++++++case+"Q2":+dateTime+=+DateTime(year,+4);
++++++break;
++++++case+"Q3":+dateTime+=+DateTime(year,+7);
++++++break;
++++++case+"Q4":+dateTime+=+DateTime(year,+10);
++++++break;
++++}|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

handling yearly quarters, from string to DateTime, I didn't find proper solution so made this:
<pre><code> List&lt;String&gt; dateAsList = 'Q1 2001'.split(' ');
 DateTime dateTime = DateTime.now();
 String quarter = dateAsList[0];
 int year = int.parse(dateAsList[1]);
 switch(quarter) {
 case &quot;Q1&quot;: dateTime = DateTime(year, 1);
 break;
 case &quot;Q2&quot;: dateTime = DateTime(year, 4);
 break;
 case &quot;Q3&quot;: dateTime = DateTime(year, 7);
 break;
 case &quot;Q4&quot;: dateTime = DateTime(year, 10);
 break;
 }
</code></pre>

entityMap|blocks|key|dqbeu|text|如果不想添加其他库，也可以使用此方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|dspud|DateTime+dateTime+=+DateTime.now();
++String+YYYY_MM_DD+=+dateTime.toIso8601String().split('T').first;
++print(YYYY_MM_DD);+//2020-11-23|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

You can use this method as well, if you don't want to add another library
<pre><code> DateTime dateTime = DateTime.now();
 String YYYY_MM_DD = dateTime.toIso8601String().split('T').first;
 print(YYYY_MM_DD); //2020-11-23

</code></pre>

entityMap|blocks|key|3gcl0|text|String+formatDate(String+date)+{
++++return+date.substring(0,+10).split('-').reversed.join().replaceAll('-',+'/');
++++
++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4mnp0|从格式"yyyy-mm-dd+H:i:s“|unstyled^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$C|D]]|$2|E|4|F|6|G|8|I|9|@]|A|@]|B|$]]]]

<pre><code>String formatDate(String date) {
 return date.substring(0, 10).split('-').reversed.join().replaceAll('-', '/');
 
 }
</code></pre>
From format &quot;yyyy-mm-dd H:i:s&quot;

entityMap|blocks|key|5s557|text|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;
++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript^0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$C|D]]]]

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

entityMap|blocks|key|gkv2|text|您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1gtq0|集成|5i0rt|在flutter中格式化日期的包。|22n22|void+main()+{
++final+DateTime+now+=+DateTime.now();
++final+DateFormat+format+=+DateFormat('yyyy-MM-dd');
++final+String+formatted+=+format.format(now);
++//+2021-03-02
}|code-block|syntax|javascript|7bmc3|或者您可以使用|4ihtq|日期|8ntdl|_|ciqpj|格式|b3j3p|94p25|import+'package:date_format/date_format.dart';

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

//02-03-2021^0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|W|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|X|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|Y|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|Z|9|@]|A|@]|B|$J|K]]|$2|L|4|M|6|7|8|10|9|@]|A|@]|B|$]]|$2|N|4|O|6|7|8|11|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|12|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|13|9|@]|A|@]|B|$]]|$2|T|4|F|6|7|8|14|9|@]|A|@]|B|$]]|$2|U|4|V|6|I|8|15|9|@]|A|@]|B|$J|K]]]]

You can use the <a href="https://pub.dev/packages/intl" rel="noreferrer">intl</a> package to format dates in flutter.
<pre><code>void main() {
 final DateTime now = DateTime.now();
 final DateFormat format = DateFormat('yyyy-MM-dd');
 final String formatted = format.format(now);
 // 2021-03-02
}
</code></pre>
or you can use <a href="https://pub.dev/packages/date_format" rel="noreferrer">date_format</a> package to format dates in flutter.
<pre><code>import 'package:date_format/date_format.dart';

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

//02-03-2021
</code></pre>

I have an instance of <code>DateTime</code> 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".

How do I format a date with Dart?

 我有一个实例 我想把它格式化成一个字符串。我该怎么做呢？我想将日期转换为字符串，类似于"2013-04-20“。

问如何使用Dart设置日期格式？
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