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    <p>Use <a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#parse-java.lang.CharSequence-java.time.format.DateTimeFormatter-" rel="noreferrer"><code>LocalDateTime#parse()</code></a> (or <a href="https://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html#parse-java.lang.CharSequence-java.time.format.DateTimeFormatter-" rel="noreferrer"><code>ZonedDateTime#parse()</code></a> if the string happens to contain a time zone part) to parse a <code>String</code> in a certain pattern into a <code>LocalDateTime</code>.</p> <pre><code>String oldstring = "2011-01-18 00:00:00.0"; LocalDateTime datetime = LocalDateTime.parse(oldstring, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S")); </code></pre> <p>Use <a href="https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#format-java.time.format.DateTimeFormatter-" rel="noreferrer"><code>LocalDateTime#format()</code></a> (or <a href="https://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html#format-java.time.format.DateTimeFormatter-" rel="noreferrer"><code>ZonedDateTime#format()</code></a>) to format a <code>LocalDateTime</code> into a <code>String</code> in a certain pattern.</p> <pre><code>String newstring = datetime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")); System.out.println(newstring); // 2011-01-18 </code></pre> <p><strong>Or</strong>, when you're not on Java 8 yet, use <a href="http://docs.oracle.com/javase/8/docs/api/java/text/DateFormat.html#parse-java.lang.String-" rel="noreferrer"><code>SimpleDateFormat#parse()</code></a> to parse a <code>String</code> in a certain pattern into a <code>Date</code>.</p> <pre><code>String oldstring = "2011-01-18 00:00:00.0"; Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S").parse(oldstring); </code></pre> <p>Use <a href="http://docs.oracle.com/javase/8/docs/api/java/text/DateFormat.html#format-java.util.Date-" rel="noreferrer"><code>SimpleDateFormat#format()</code></a> to format a <code>Date</code> into a <code>String</code> in a certain pattern.</p> <pre><code>String newstring = new SimpleDateFormat("yyyy-MM-dd").format(date); System.out.println(newstring); // 2011-01-18 </code></pre> <h3>See also:</h3> <ul> <li><a href="https://stackoverflow.com/questions/4216745/java-string-to-date-conversion/">Java string to date conversion</a></li> </ul> <hr> <p><strong>Update</strong>: as per your failed attempt: the patterns are <strong>case sensitive</strong>. Read the <a href="http://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html" rel="noreferrer"><code>java.text.SimpleDateFormat</code> javadoc</a> what the individual parts stands for. So stands for example <code>M</code> for months and <code>m</code> for minutes. Also, years exist of four digits <code>yyyy</code>, not five <code>yyyyy</code>. Look closer at the code snippets I posted here above.</p>
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