title: Set Android's date/time programmatically
body: <p>I need set the date/time from Android programmatically, but I'm not having success!
  I have these three sources above:</p>
  
  <p>Source code 1</p>
  
  <pre><code>AlarmManager alarm = (AlarmManager) getSystemService(ALARM_SERVICE);  
  alarm.setTime(1330082817000); 
  </code></pre>
  
  <p>AndroidManifest:</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.SET_TIME" /&gt;  
  &lt;uses-permission android:name="android.permission.SET_TIME_ZONE" /&gt;  
  </code></pre>
  
  <p>Exception:</p>
  
  <pre><code>Service fatal error : Unable to start activity ComponentInfo{br.com.tdta.service/br.com.tdta.service.Service}: java.lang.SecurityException: setTime: Neither user 10038 nor current process has android.permission.SET_TIME.  
  java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.tdta.service/br.com.tdta.service.Service}: java.lang.SecurityException: setTime: Neither user 10038 nor current process has android.permission.SET_TIME.  
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)  
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)  
      at android.app.ActivityThread.access$2300(ActivityThread.java:125)  
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)  
      at android.os.Handler.dispatchMessage(Handler.java:99)  
      at android.os.Looper.loop(Looper.java:123)  
      at android.app.ActivityThread.main(ActivityThread.java:4627)  
      at java.lang.reflect.Method.invokeNative(Native Method)  
      at java.lang.reflect.Method.invoke(Method.java:521)  
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)  
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)  
      at dalvik.system.NativeStart.main(Native Method)  
  Caused by: java.lang.SecurityException: setTime: Neither user 10038 nor current process has android.permission.SET_TIME.  
      at android.os.Parcel.readException(Parcel.java:1247)  
      at android.os.Parcel.readException(Parcel.java:1235)  
      at android.app.IAlarmManager$Stub$Proxy.setTime(IAlarmManager.java:237)  
      at android.app.AlarmManager.setTime(AlarmManager.java:289)  
      at br.com.tdta.service.Service.onCreate(Service.java:32)  
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)  
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)  
  ... 11 more  
  </code></pre>
  
  <p>====</p>
  
  <p>Source code 2</p>
  
  <pre><code>boolean itsWork = SystemClock.setCurrentTimeMillis(1330082817000);  
  System.out.println(itsWork);  
  </code></pre>
  
  <p>Manifest:</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.SET_TIME" /&gt;  
  &lt;uses-permission android:name="android.permission.SET_TIME_ZONE" /&gt;  
  </code></pre>
  
  <p><strong>itsWork</strong> value:</p>
  
  <pre><code>false  
  </code></pre>
  
  <p>====</p>
  
  <p>Source code 3</p>
  
  <pre><code>SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd.hhmmss");
  String data = format.format(new Date(1330082817000));
  try {
      Runtime.getRuntime().exec("date -s " + data);
  } catch (IOException e) {
  }
  </code></pre>
  
  <p>What am I doing wrong?</p>
  
  <p>Thanks in advance!</p>