blocks|key|2585593|text|我不确定这是否能解决你的问题，但是mm应该是大写的，也就是MM，因为MM描述月份，而mm描述分钟。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2585594|请参阅以下代码：|2585595|DateFormat+dateFormat+=+new+SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss.SSSZ%2B%7C-+
++++hh:mm");|code-block|syntax|javascript|2585596|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I am not certain that this will solve your problem, 
But mm should be uppercase i.e MM, 
Because MM describes months while mm describes minutes.

see the following code:

<pre><code>DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss.SSSZ+|- 
 hh:mm");
</code></pre>

blocks|key|77754|text|为什么不在DateTime对象上使用toString()呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|77755|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

why not use toString() on your DateTime object?

blocks|key|2585657|text|正如Thomas在评论中提到的，DateTime.format()使用Date对象，而不是DateTime对象；因此使用IllegalArgumentException。从日期的格式判断，您可以尝试使用内置的java.time.ZonedDateTime类解析startString：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2585658|ZonedDateTime+dateTime+=+ZonedDateTime.parse(startString)+//it+can+parse+ISO-8601+date-times|code-block|syntax|javascript|2585659|然后，可以使用java.time.DateTimeFormatter的静态ofPattern()方法格式化dateTime对象，该方法采用String模式应用于日期-时间，并以字符串形式返回格式化的日期：|2585660|String+formattedDateTime+=+dateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'hh:mm:ss.SSSZ%2B%7C-hh:mm"));|2585661|2585662|编辑|BOLD|2585663|正如Basil指出的那样，OP的DateTime对象包括一个时间偏移量，它不一定是时区偏移量--正如ZonedDateTime类所表示的那样。因此，在此场景中使用的最合适的类是OffsetDateTime，它提供相同的功能，但更适合给定的用例。请参阅Basil+Bourque's+answer|2585664|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/54815278/3864051^0|G|H|Z|4|19|8|1O|O|2W|N|3M|B|0|0|7|R|11|B|1H|8|1X|6|0|0|0|0|2|0|G|8|1E|D|2G|E|3H|M|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1F|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|1P|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1R|8|@$9|1S|A|1T|B|R]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1U|8|@$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]]|D|@$9|21|A|22|1|23]]|E|$]]|$1|U|3|-4|5|6|7|24|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

As Thomas alluded to in the comments, <code>DateTime.format()</code> consumes a <code>Date</code> object, not a <code>DateTime</code> object; hence the <code>IllegalArgumentException</code>. Judging by the format of your date you could try parsing your <code>startString</code> using the in-built <code>java.time.ZonedDateTime</code> class:

<pre><code>ZonedDateTime dateTime = ZonedDateTime.parse(startString) //it can parse ISO-8601 date-times
</code></pre>

You could then format your <code>dateTime</code> object using <code>java.time.DateTimeFormatter</code>'s static <code>ofPattern()</code> method which takes a <code>String</code> pattern to apply to your date-time and returns the formatted date as a String:

<pre><code>String formattedDateTime = dateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'hh:mm:ss.SSSZ+|-hh:mm"));
</code></pre>

<hr>

EDIT

As Basil pointed out, the OP's <code>DateTime</code> object includes a time offset which is not necessarily a time zone offset--as is represented by the <code>ZonedDateTime</code> class. Thus the most appropriate class to use in this scenario is <code>OffsetDateTime</code> which provides the same capabilities but is more suited for the given use case. See <a href="https://stackoverflow.com/a/54815278/3864051">Basil Bourque's answer</a>

blocks|key|75517|text|我发现以下内容对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|75518|DateTimeFormatter+dateTimeFormatter+=+DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS[XXX]");
String+formatted+=+zonedDateTime.format(dateTimeFormatter);|code-block|syntax|javascript|75519|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have found the following to work for me

<pre><code>DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS[XXX]");
String formatted = zonedDateTime.format(dateTimeFormatter);
</code></pre>

blocks|key|75292|text|tl;dr|type|unstyled|depth|inlineStyleRanges|entityRanges|data|75293|java.time.OffsetDateTime.parse(+"2019-02-21T09:47:58.699004%2B00:00"+)|code-block|syntax|javascript|75294|java.time|75295|DateTime是什么类？如果您正在使用Joda-Time，请知道Joda-Time项目现在处于维护模式。它的创建者Stephen+Colbourne继续领导JSR310并实现了内置到Java语言中的java.time类。|offset|length|style|CODE|75296|不需要格式化模式|75297|您的输入字符串为标准ISO+8601格式。在解析/生成字符串时，java.time类默认使用ISO8601格式。|75298|String+input+=+"2019-02-21T09:47:58.699004%2B00:00"+;++//+Standard+ISO+8601+format.|75299|OffsetDateTime|75300|您的输入字符串指示offset-from-UTC，但不是时区。因此，表示该值的适当类是OffsetDateTime。|75301|OffsetDateTime+odt+=+OffsetDateTime.parse(+input+)+;|75302|75303|关于java.time|75304|框架内置于Java8和更高版本中。这些类取代了麻烦的旧legacy日期时间类，如java.util.Date、Calendar和SimpleDateFormat。|75305|要了解更多信息，请参阅。和搜索堆栈溢出，以获得许多示例和解释。规范为JSR+310。|75306|现在在maintenance+mode中的项目建议迁移到java.time类。|75307|您可以直接与数据库交换java.time对象。使用与JDBC+4.2或更高版本兼容的JDBC+driver。不需要字符串，也不需要java.sql.*类。|75308|从哪里获取java.time类？|75309|75310|，、、和更高版本-标准Java+API的一部分，具有捆绑的实现。|unordered-list-item|75311|Java9添加了一些次要功能和fixes.|75312|75313|75314|​|75315|75316|和.|75317|中的+|75318|大多数java.time功能已向后移植到Java6和7|75319|75320|75321|75322|+|75323|更高版本的Android捆绑实现的java.time类。|75324|对于较早的Android+(<26)，项目适配+(如上所述)。请参阅.|75325|75326|75327|75328|项目使用额外的类扩展了java.time。这个项目是未来可能添加到java.time中的试验场。您可能会在这里找到一些有用的类，如Interval、YearWeek、YearQuarter和more。|75329|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/ISO_8601|1|https://en.wikipedia.org/wiki/UTC_offset|2|https://en.wikipedia.org/wiki/Legacy_system|3|https://docs.oracle.com/javase/10/docs/api/java/util/Date.html|4|https://docs.oracle.com/javase/10/docs/api/java/util/Calendar.html|5|http://docs.oracle.com/javase/10/docs/api/java/text/SimpleDateFormat.html|6|https://jcp.org/en/jsr/detail?id=310|7|https://en.wikipedia.org/wiki/Maintenance_mode|8|http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html|9|http://openjdk.java.net/jeps/170|10|https://en.wikipedia.org/wiki/JDBC_driver|11|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Interval.html|12|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearWeek.html|13|http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearQuarter.html|14|http://www.threeten.org/threeten-extra/apidocs/index.html^0|0|0|0|0|8|0|0|A|8|0|0|0|0|E|0|17|E|9|F|1|0|0|0|0|14|E|1J|8|1S|G|R|6|2|14|E|3|1J|8|4|1S|G|5|0|Y|7|6|0|3|G|7|S|9|8|0|1T|A|Q|8|9|16|B|A|0|0|0|1|1|0|0|0|0|0|0|0|0|0|0|1|1|1|0|0|0|1T|8|22|8|2B|B|1T|8|B|22|8|C|2B|B|D|2N|4|E|0^^$0|@$1|2|3|4|5|6|7|38|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|39|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|3A|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|3B|8|@$K|3C|L|3D|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|3E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|3F|8|@]|9|@$K|3G|L|3H|1|3I]]|A|$]]|$1|S|3|T|5|D|7|3J|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|3K|8|@$K|3L|L|3M|M|N]]|9|@]|A|$]]|$1|W|3|X|5|6|7|3N|8|@$K|3O|L|3P|M|N]]|9|@$K|3Q|L|3R|1|3S]]|A|$]]|$1|Y|3|Z|5|D|7|3T|8|@]|9|@]|A|$E|F]]|$1|10|3|-4|5|6|7|3U|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|3V|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|3W|8|@$K|3X|L|3Y|M|N]|$K|3Z|L|40|M|N]|$K|41|L|42|M|N]]|9|@$K|43|L|44|1|45]|$K|46|L|47|1|48]|$K|49|L|4A|1|4B]|$K|4C|L|4D|1|4E]]|A|$]]|$1|15|3|16|5|6|7|4F|8|@]|9|@$K|4G|L|4H|1|4I]]|A|$]]|$1|17|3|18|5|6|7|4J|8|@]|9|@$K|4K|L|4L|1|4M]|$K|4N|L|4O|1|4P]]|A|$]]|$1|19|3|1A|5|6|7|4Q|8|@$K|4R|L|4S|M|N]]|9|@$K|4T|L|4U|1|4V]|$K|4W|L|4X|1|4Y]]|A|$]]|$1|1B|3|1C|5|6|7|4Z|8|@]|9|@]|A|$]]|$1|1D|3|-4|5|6|7|50|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|1G|7|51|8|@]|9|@]|A|$]]|$1|1H|3|1I|5|1G|7|52|8|@]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|53|8|@]|9|@]|A|$]]|$1|1K|3|-4|5|6|7|54|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|55|8|@]|9|@]|A|$]]|$1|1N|3|-4|5|6|7|56|8|@]|9|@]|A|$]]|$1|1O|3|1P|5|1G|7|57|8|@]|9|@]|A|$]]|$1|1Q|3|1R|5|6|7|58|8|@]|9|@]|A|$]]|$1|1S|3|1T|5|1G|7|59|8|@]|9|@]|A|$]]|$1|1U|3|-4|5|6|7|5A|8|@]|9|@]|A|$]]|$1|1V|3|1M|5|6|7|5B|8|@]|9|@]|A|$]]|$1|1W|3|-4|5|6|7|5C|8|@]|9|@]|A|$]]|$1|1X|3|1Y|5|1G|7|5D|8|@]|9|@]|A|$]]|$1|1Z|3|20|5|1G|7|5E|8|@]|9|@]|A|$]]|$1|21|3|22|5|1G|7|5F|8|@]|9|@]|A|$]]|$1|23|3|-4|5|6|7|5G|8|@]|9|@]|A|$]]|$1|24|3|-4|5|6|7|5H|8|@]|9|@]|A|$]]|$1|25|3|1M|5|6|7|5I|8|@]|9|@]|A|$]]|$1|26|3|27|5|6|7|5J|8|@$K|5K|L|5L|M|N]|$K|5M|L|5N|M|N]|$K|5O|L|5P|M|N]]|9|@$K|5Q|L|5R|1|5S]|$K|5T|L|5U|1|5V]|$K|5W|L|5X|1|5Y]|$K|5Z|L|60|1|61]]|A|$]]|$1|28|3|-4|5|6|7|62|8|@]|9|@]|A|$]]]|29|$2A|$5|2B|2C|2D|A|$2E|2F]]|2G|$5|2B|2C|2D|A|$2E|2H]]|2I|$5|2B|2C|2D|A|$2E|2J]]|2K|$5|2B|2C|2D|A|$2E|2L]]|2M|$5|2B|2C|2D|A|$2E|2N]]|2O|$5|2B|2C|2D|A|$2E|2P]]|2Q|$5|2B|2C|2D|A|$2E|2R]]|2S|$5|2B|2C|2D|A|$2E|2T]]|2U|$5|2B|2C|2D|A|$2E|2V]]|2W|$5|2B|2C|2D|A|$2E|2X]]|2Y|$5|2B|2C|2D|A|$2E|2Z]]|30|$5|2B|2C|2D|A|$2E|31]]|32|$5|2B|2C|2D|A|$2E|33]]|34|$5|2B|2C|2D|A|$2E|35]]|36|$5|2B|2C|2D|A|$2E|37]]]]

<h1>tl;dr</h1>

<pre><code>java.time.OffsetDateTime.parse( "2019-02-21T09:47:58.699004+00:00" )
</code></pre>

<h1>java.time</h1>

What class is <code>DateTime</code>? If you are using Joda-Time, know that the Joda-Time project is now in maintenance-mode. Its creator, Stephen Colbourne, went on to lead JSR 310 and implement the java.time classes built into Java.

<h1>No need for formatting pattern</h1>

Your input string is in standard <a href="https://en.wikipedia.org/wiki/ISO_8601" rel="nofollow noreferrer">ISO 8601</a> format. The java.time classes use the ISO 8601 formats by default when parsing/generating strings.

<pre><code>String input = "2019-02-21T09:47:58.699004+00:00" ; // Standard ISO 8601 format.
</code></pre>

<h1><code>OffsetDateTime</code></h1>

Your input string indicates an <a href="https://en.wikipedia.org/wiki/UTC_offset" rel="nofollow noreferrer">offset-from-UTC</a> but not a time zone. So the appropriate class to represent this value is <code>OffsetDateTime</code>.

<pre><code>OffsetDateTime odt = OffsetDateTime.parse( input ) ;
</code></pre>

<hr>

<h1>About java.time</h1>

The <a href="http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> framework is built into Java 8 and later. These classes supplant the troublesome old <a href="https://en.wikipedia.org/wiki/Legacy_system" rel="nofollow noreferrer">legacy</a> date-time classes such as <a href="https://docs.oracle.com/javase/10/docs/api/java/util/Date.html" rel="nofollow noreferrer"><code>java.util.Date</code></a>, <a href="https://docs.oracle.com/javase/10/docs/api/java/util/Calendar.html" rel="nofollow noreferrer"><code>Calendar</code></a>, &amp; <a href="http://docs.oracle.com/javase/10/docs/api/java/text/SimpleDateFormat.html" rel="nofollow noreferrer"><code>SimpleDateFormat</code></a>.

To learn more, see the <a href="http://docs.oracle.com/javase/tutorial/datetime/TOC.html" rel="nofollow noreferrer">Oracle Tutorial</a>. And search Stack Overflow for many examples and explanations. Specification is <a href="https://jcp.org/en/jsr/detail?id=310" rel="nofollow noreferrer">JSR 310</a>.

The <a href="http://www.joda.org/joda-time/" rel="nofollow noreferrer">Joda-Time</a> project, now in <a href="https://en.wikipedia.org/wiki/Maintenance_mode" rel="nofollow noreferrer">maintenance mode</a>, advises migration to the <a href="http://docs.oracle.com/javase/10/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> classes.

You may exchange java.time objects directly with your database. Use a <a href="https://en.wikipedia.org/wiki/JDBC_driver" rel="nofollow noreferrer">JDBC driver</a> compliant with <a href="http://openjdk.java.net/jeps/170" rel="nofollow noreferrer">JDBC 4.2</a> or later. No need for strings, no need for <code>java.sql.*</code> classes.

Where to obtain the java.time classes? 

<ul>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8" rel="nofollow noreferrer">Java SE 8</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_9" rel="nofollow noreferrer">Java SE 9</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_10" rel="nofollow noreferrer">Java SE 10</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_11" rel="nofollow noreferrer">Java SE 11</a>, and later - Part of the standard Java API with a bundled implementation.

<ul>
<li>Java 9 adds some minor features and fixes.</li>
</ul></li>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_6" rel="nofollow noreferrer">Java SE 6</a> and <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7" rel="nofollow noreferrer">Java SE 7</a>

<ul>
<li>Most of the java.time functionality is back-ported to Java 6 &amp; 7 in <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a>.</li>
</ul></li>
<li><a href="https://en.wikipedia.org/wiki/Android_(operating_system)" rel="nofollow noreferrer">Android</a>

<ul>
<li>Later versions of Android bundle implementations of the java.time classes.</li>
<li>For earlier Android (&lt;26), the <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenABP</a> project adapts <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a> (mentioned above). See <a href="http://stackoverflow.com/q/38922754/642706">How to use ThreeTenABP…</a>.</li>
</ul></li>
</ul>

The <a href="http://www.threeten.org/threeten-extra/" rel="nofollow noreferrer">ThreeTen-Extra</a> project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/Interval.html" rel="nofollow noreferrer"><code>Interval</code></a>, <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearWeek.html" rel="nofollow noreferrer"><code>YearWeek</code></a>, <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearQuarter.html" rel="nofollow noreferrer"><code>YearQuarter</code></a>, and <a href="http://www.threeten.org/threeten-extra/apidocs/index.html" rel="nofollow noreferrer">more</a>.

I have a simple question. How can I convert an ISO-8601 Date to an String?
I'm using a Date with the following format: <code>2019-02-05T08:21:15.000+01:00</code> and want to convert this Date Object to an String. I tried the following:

<pre class="lang-java prettyprint-override"><code>String startString = (String) jsonObjectMap2.get("created_on"); 
//startString = "2019-02-21T09:47:58.699004+00:00"`
</code></pre>

<pre class="lang-java prettyprint-override"><code>DateTime start = ISODateTimeFormat.dateTimeParser().parseDateTime(startString);
DateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd'T'hh:mm:ss.SSSZ+|-hh:mm"); 
String formatedStartString = dateFormat.format(start);`
</code></pre>

But Iam getting the following error:

<blockquote>
 java.lang.IllegalArgumentException: Cannot format given Object as a Date.
</blockquote>

What is the corrrect form of the DateFormat? I hope you can help me, thank you in advance.

Converting a DateTime Object to an String

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我有一个简单的问题。如何将ISO-8601日期转换为字符串？我使用的日期格式如下：2019-02-05T08:21:15.000+01:00，并希望将此日期对象转换为字符串。我尝试了以下几种方法：String startString = (String) jsonObjectMap2.get("created_on")...

问将DateTime对象转换为字符串
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