blocks|key|244589|text|SimpleDateFormat+dateFormat+=+new+SimpleDateFormat("dd-MM-yyyy");
Date+d+=+dateFormat.parse(datestring)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|244590|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
Date d = dateFormat.parse(datestring)
</code></pre>

blocks|key|242368|text|从字符串到日期|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242369|String+dtStart+=+"2010-10-15T09:27:37Z";++
SimpleDateFormat+format+=+new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");++
try+{++
++++Date+date+=+format.parse(dtStart);++
++++System.out.println(date);++
}+catch+(ParseException+e)+{
++++e.printStackTrace();++
}|code-block|syntax|javascript|242370|从日期到字符串|242371|SimpleDateFormat+dateFormat+=+new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");++
try+{++
++++Date+date+=+new+Date();++
++++String+dateTime+=+dateFormat.format(date);
++++System.out.println("Current+Date+Time+:+"+%2B+dateTime);+
}+catch+(ParseException+e)+{
++++e.printStackTrace();++
}|242372|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

From String to Date

<pre><code>String dtStart = "2010-10-15T09:27:37Z"; 
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); 
try { 
 Date date = format.parse(dtStart); 
 System.out.println(date); 
} catch (ParseException e) {
 e.printStackTrace(); 
}
</code></pre>

From Date to String

<pre><code>SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); 
try { 
 Date date = new Date(); 
 String dateTime = dateFormat.format(date);
 System.out.println("Current Date Time : " + dateTime); 
} catch (ParseException e) {
 e.printStackTrace(); 
}
</code></pre>

blocks|key|244615|text|通过使用SimpleDateFormat或DateFormat类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|244616|例如|244617|try{
SimpleDateFormat+sdf+=+new+SimpleDateFormat("dd/MM/yyyy");+//+here+set+the+pattern+as+you+date+in+string+was+containing+like+date/month/year
Date+d+=+sdf.parse("20/12/2011");
}catch(ParseException+ex){
++++//+handle+parsing+exception+if+date+string+was+different+from+the+pattern+applying+into+the+SimpleDateFormat+contructor
}|code-block|syntax|javascript|244618|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|$]]

using SimpleDateFormat or DateFormat class through

for e.g. 

<pre><code>try{
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); // here set the pattern as you date in string was containing like date/month/year
Date d = sdf.parse("20/12/2011");
}catch(ParseException ex){
 // handle parsing exception if date string was different from the pattern applying into the SimpleDateFormat contructor
}
</code></pre>

blocks|key|242402|text|谨慎对待c.getTime().toString();所依赖的语言环境可能是个好主意。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|242403|一种想法是以秒为单位存储时间(例如UNIX+time)。作为int，您可以很容易地比较它，然后在向用户显示它时，您只需将其转换为字符串。|242404|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Unix_time^0|4|N|0|U|3|H|9|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

It could be a good idea to be careful with the Locale upon which <code>c.getTime().toString();</code> depends.

One idea is to store the time in seconds (e.g. <a href="http://en.wikipedia.org/wiki/Unix_time" rel="nofollow">UNIX time</a>). As an <code>int</code> you can easily compare it, and then you just convert it to string when displaying it to the user.

blocks|key|3132804|text|String+source+=+"24/10/17";

String[]+sourceSplit=+source.split("/");

int+anno=+Integer.parseInt(sourceSplit[2]);
int+mese=+Integer.parseInt(sourceSplit[1]);
int+giorno=+Integer.parseInt(sourceSplit[0]);

++++GregorianCalendar+calendar+=+new+GregorianCalendar();
++calendar.set(anno,mese-1,giorno);
++Date+++data1=+calendar.getTime();
++SimpleDateFormat+myFormat+=+new+SimpleDateFormat("20yy-MM-dd");

++++String+++dayFormatted=+myFormat.format(data1);

++++System.out.println("data+formattata,-->"%2BdayFormatted);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3132805|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>String source = "24/10/17";

String[] sourceSplit= source.split("/");

int anno= Integer.parseInt(sourceSplit[2]);
int mese= Integer.parseInt(sourceSplit[1]);
int giorno= Integer.parseInt(sourceSplit[0]);

 GregorianCalendar calendar = new GregorianCalendar();
 calendar.set(anno,mese-1,giorno);
 Date data1= calendar.getTime();
 SimpleDateFormat myFormat = new SimpleDateFormat("20yy-MM-dd");

 String dayFormatted= myFormat.format(data1);

 System.out.println("data formattata,--&gt;"+dayFormatted);
</code></pre>

blocks|key|3132834|text|+++++import+java.text.ParseException;
+++++import+java.text.SimpleDateFormat;
+++++import+java.util.Date;
+++++public+class+MyClass+
+++++{
+++++public+static+void+main(String+args[])+
+++++{
+++++SimpleDateFormat+formatter+=+new+SimpleDateFormat("EEE+MMM+dd+HH:mm:ss+Z+yyyy");

+++++String+dateInString+=+"Wed+Mar+14+15:30:00+EET+2018";

+++++SimpleDateFormat+formatterOut+=+new+SimpleDateFormat("dd+MMM+yyyy");


+++++try+{

++++++++Date+date+=+formatter.parse(dateInString);
++++++++System.out.println(date);
++++++++System.out.println(formatterOut.format(date));

+++++++++}+catch+(ParseException+e)+{
++++++++e.printStackTrace();
+++++++++}
++++}
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3132835|unstyled|3132836|这里是您的Date对象date，输出为：|blockquote|offset|length|style|BOLD|3132837|3132838|3132839|UTC+Wed+Mar+14+13:30:00++2018|3132840|2018年3月14日|3132841|entityMap^0|0|0|B|4|0|0|0|O|5|0|0|A|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|E|7|Z|8|@]|9|@]|A|$]]|$1|N|3|-4|5|E|7|10|8|@]|9|@]|A|$]]|$1|O|3|P|5|E|7|11|8|@$I|12|J|13|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|E|7|14|8|@$I|15|J|16|K|L]]|9|@]|A|$]]|$1|S|3|-4|5|E|7|17|8|@]|9|@]|A|$]]]|T|$]]

<pre><code> import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 public class MyClass 
 {
 public static void main(String args[]) 
 {
 SimpleDateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss Z yyyy");

 String dateInString = "Wed Mar 14 15:30:00 EET 2018";

 SimpleDateFormat formatterOut = new SimpleDateFormat("dd MMM yyyy");


 try {

 Date date = formatter.parse(dateInString);
 System.out.println(date);
 System.out.println(formatterOut.format(date));

 } catch (ParseException e) {
 e.printStackTrace();
 }
 }
 }
</code></pre>

<blockquote>
 here is your Date object date
 and the output is :
</blockquote>

Wed Mar 14 13:30:00 UTC 2018

14 Mar 2018

blocks|key|3132907|text|你现在可以在安卓系统中使用java.time了，可以使用Android+API+Desugaring，也可以导入ThreeTenAbp。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3132908|启用java.time后，您可以使用更少的代码和更少的错误执行相同的操作。|3132909|假设您正在传递一个包含采用ISO标准格式化的日期时间的String，正如当前接受的答案所做的那样。|3132910|然后，下面的方法及其在main中的用法可能会向您展示如何从String转换为how|3132911|public+static+void+main(String[]+args)+{
++++String+dtStart+=+"2010-10-15T09:27:37Z";
++++ZonedDateTime+odt+=+convert(dtStart);
++++System.out.println(odt);
}|code-block|syntax|javascript|3132912|和|3132913|public+static+void+main(String[]+args)+{
++++String+dtStart+=+"2010-10-15T09:27:37Z";
++++OffsetDateTime+odt+=+convert(dtStart);
++++System.out.println(odt);
}|3132914|将打印该行|3132915|2010-10-15T09:27:37Z|3132916|当有相应的方法时|3132917|public+static+OffsetDateTime+convert(String+datetime)+{
++++return+OffsetDateTime.parse(datetime);
}|3132918|或|3132919|public+static+ZonedDateTime+convert(String+datetime)+{
++++return+ZonedDateTime.parse(datetime);
}|3132920|但当然不是在同一个类中，这不会编译...|3132921|也有一个LocalDateTime，但它不能解析区域或偏移量。|3132922|如果您希望使用自定义格式解析或格式化输出，则可以使用DateTimeFormatter，可能如下所示：|3132923|public+static+void+main(String[]+args)+{
++++String+dtStart+=+"2010-10-15T09:27:37Z";
++++String+converted+=+ZonedDateTime.parse(dtStart)
++++++++++++++++++++++++++++++++++++.format(DateTimeFormatter.ofPattern(
++++++++++++++++++++++++++++++++++++++++++++++++++++"EEE+MMM+d+HH:mm:ss+zz+uuuu",
++++++++++++++++++++++++++++++++++++++++++++++++++++Locale.ENGLISH
++++++++++++++++++++++++++++++++++++++++++++++++)
++++++++++++++++++++++++++++++++++++++++++++);
++++System.out.println(converted);
}|3132924|它将输出以下内容|3132925|Fri+Oct+15+09:27:37+Z+2010|3132926|对于OffsetDateTime，您需要稍微调整一下样式：|3132927|public+static+void+main(String[]+args)+{
++++String+dtStart+=+"2010-10-15T09:27:37Z";
++++String+converted+=+OffsetDateTime.parse(dtStart)
++++++++++++++++++++++++++++++++++++.format(DateTimeFormatter.ofPattern(
++++++++++++++++++++++++++++++++++++++++++++++++++++"EEE+MMM+d+HH:mm:ss+xxx+uuuu",
++++++++++++++++++++++++++++++++++++++++++++++++++++Locale.ENGLISH
++++++++++++++++++++++++++++++++++++++++++++++++)
++++++++++++++++++++++++++++++++++++++++++++);
++++System.out.println(converted);
}|3132928|这将产生(略微)不同的输出：|3132929|Fri+Oct+15+09:27:37+%2B00:00+2010|3132930|这是因为ZonedDateTime认为命名时区具有变化的偏移量(由于夏令时或类似的时间)，而OffsetDateTime只知道来自协调世界时的偏移量。|3132931|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/studio/write/java8-support|1|https://github.com/JakeWharton/ThreeTenABP^0|D|9|S|M|0|1K|B|1|0|2|9|0|R|6|0|B|4|T|6|0|0|0|0|0|0|0|0|0|0|0|4|D|0|Q|H|0|0|0|0|2|E|0|0|0|0|4|D|1A|E|0^^$0|@$1|2|3|4|5|6|7|22|8|@$9|23|A|24|B|C]]|D|@$9|25|A|26|1|27]|$9|28|A|29|1|2A]]|E|$]]|$1|F|3|G|5|6|7|2B|8|@$9|2C|A|2D|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|2E|8|@$9|2F|A|2G|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|2H|8|@$9|2I|A|2J|B|C]|$9|2K|A|2L|B|C]]|D|@]|E|$]]|$1|L|3|M|5|N|7|2M|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|2N|8|@]|D|@]|E|$]]|$1|S|3|T|5|N|7|2O|8|@]|D|@]|E|$O|P]]|$1|U|3|V|5|6|7|2P|8|@]|D|@]|E|$]]|$1|W|3|X|5|N|7|2Q|8|@]|D|@]|E|$O|P]]|$1|Y|3|Z|5|6|7|2R|8|@]|D|@]|E|$]]|$1|10|3|11|5|N|7|2S|8|@]|D|@]|E|$O|P]]|$1|12|3|13|5|6|7|2T|8|@]|D|@]|E|$]]|$1|14|3|15|5|N|7|2U|8|@]|D|@]|E|$O|P]]|$1|16|3|17|5|6|7|2V|8|@]|D|@]|E|$]]|$1|18|3|19|5|6|7|2W|8|@$9|2X|A|2Y|B|C]]|D|@]|E|$]]|$1|1A|3|1B|5|6|7|2Z|8|@$9|30|A|31|B|C]]|D|@]|E|$]]|$1|1C|3|1D|5|N|7|32|8|@]|D|@]|E|$O|P]]|$1|1E|3|1F|5|6|7|33|8|@]|D|@]|E|$]]|$1|1G|3|1H|5|N|7|34|8|@]|D|@]|E|$O|P]]|$1|1I|3|1J|5|6|7|35|8|@$9|36|A|37|B|C]]|D|@]|E|$]]|$1|1K|3|1L|5|N|7|38|8|@]|D|@]|E|$O|P]]|$1|1M|3|1N|5|6|7|39|8|@]|D|@]|E|$]]|$1|1O|3|1P|5|N|7|3A|8|@]|D|@]|E|$O|P]]|$1|1Q|3|1R|5|6|7|3B|8|@$9|3C|A|3D|B|C]|$9|3E|A|3F|B|C]]|D|@]|E|$]]|$1|1S|3|-4|5|6|7|3G|8|@]|D|@]|E|$]]]|1T|$1U|$5|1V|1W|1X|E|$1Y|1Z]]|20|$5|1V|1W|1X|E|$1Y|21]]]]

You can use <code>java.time</code> in Android now, either by using <a href="https://developer.android.com/studio/write/java8-support" rel="nofollow noreferrer">Android API Desugaring</a> or importing the <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenAbp</a>.
With <code>java.time</code> enabled, you can do the same operations with less code and less errors.
Let's assume you are passing a <code>String</code> containing a datetime formatted in ISO standard, just as the currently accepted answer does. 
Then the following methods and their usage in a <code>main</code> may show you how to convert from and to <code>String</code>:
<pre class="lang-java prettyprint-override"><code>public static void main(String[] args) {
 String dtStart = &quot;2010-10-15T09:27:37Z&quot;;
 ZonedDateTime odt = convert(dtStart);
 System.out.println(odt);
}
</code></pre>
and
<pre class="lang-java prettyprint-override"><code>public static void main(String[] args) {
 String dtStart = &quot;2010-10-15T09:27:37Z&quot;;
 OffsetDateTime odt = convert(dtStart);
 System.out.println(odt);
}
</code></pre>
will print the line
<pre class="lang-none prettyprint-override"><code>2010-10-15T09:27:37Z
</code></pre>
when there are the corresponding methods
<pre class="lang-java prettyprint-override"><code>public static OffsetDateTime convert(String datetime) {
 return OffsetDateTime.parse(datetime);
}
</code></pre>
or
<pre class="lang-java prettyprint-override"><code>public static ZonedDateTime convert(String datetime) {
 return ZonedDateTime.parse(datetime);
}
</code></pre>
but of course not in the same class, that would not compile...
There's a <code>LocalDateTime</code>, too, but that would not be able to parse a zone or offset.
If you want to use custom formats for parsing or formatting output, you can utilize a <code>DateTimeFormatter</code>, maybe like this:
<pre class="lang-java prettyprint-override"><code>public static void main(String[] args) {
 String dtStart = &quot;2010-10-15T09:27:37Z&quot;;
 String converted = ZonedDateTime.parse(dtStart)
 .format(DateTimeFormatter.ofPattern(
 &quot;EEE MMM d HH:mm:ss zz uuuu&quot;,
 Locale.ENGLISH
 )
 );
 System.out.println(converted);
}
</code></pre>
which will output
<pre class="lang-none prettyprint-override"><code>Fri Oct 15 09:27:37 Z 2010
</code></pre>
For an <code>OffsetDateTime</code>, you would need to adjust the pattern a little:
<pre class="lang-java prettyprint-override"><code>public static void main(String[] args) {
 String dtStart = &quot;2010-10-15T09:27:37Z&quot;;
 String converted = OffsetDateTime.parse(dtStart)
 .format(DateTimeFormatter.ofPattern(
 &quot;EEE MMM d HH:mm:ss xxx uuuu&quot;,
 Locale.ENGLISH
 )
 );
 System.out.println(converted);
}
</code></pre>
This will produce a (slightly) different output:
<pre class="lang-none prettyprint-override"><code>Fri Oct 15 09:27:37 +00:00 2010
</code></pre>
That's because a <code>ZonedDateTime</code> considers named time zones with changing offsets (due to daylight saving times or anything similar) while an <code>OffsetDateTime</code> just knows an offset from UTC.

I store current time in database each time application starts by user.

<pre><code>Calendar c = Calendar.getInstance();
 String str = c.getTime().toString();
 Log.i("Current time", str);
</code></pre>

In database side, I store current time as string (as you see in above code). Therefore, when I load it from database, I need to cast it to Date object. I saw some samples that all of them had used "DateFormat". But my format is exactly as same as Date format. So, I think there is no need to use "DateFormat". Am I right?

Is there anyway to directly cast this String to Date object? I want to compare this stored time with current time.

Thanks

======>
update

Thanks dear guys. I used following code:

<pre><code>private boolean isPackageExpired(String date){
 boolean isExpired=false;
 Date expiredDate = stringToDate(date, "EEE MMM d HH:mm:ss zz yyyy"); 
 if (new Date().after(expiredDate)) isExpired=true;

 return isExpired;
 }

 private Date stringToDate(String aDate,String aFormat) {

 if(aDate==null) return null;
 ParsePosition pos = new ParsePosition(0);
 SimpleDateFormat simpledateformat = new SimpleDateFormat(aFormat);
 Date stringDate = simpledateformat.parse(aDate, pos);
 return stringDate; 

 }
</code></pre>

Android, How can I Convert String to Date?

数据库

每次用户启动应用程序时，我都会将当前时间存储在数据库中。Calendar c = Calendar.getInstance();    String str = c.getTime().toString();    Log.i("Current time", str);在数据库端，我将当前时间存储为字符串(如上面的代码...

问Android，如何将字符串转换为日期？
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