Set Android's date/time programmatically

Question

I need set the date/time from Android programmatically, but I'm not having success! I have these three sources above:

Source code 1

AlarmManager alarm = (AlarmManager) getSystemService(ALARM_SERVICE);  
alarm.setTime(1330082817000); 

AndroidManifest:

<uses-permission android:name="android.permission.SET_TIME" />  
<uses-permission android:name="android.permission.SET_TIME_ZONE" />  

Exception:

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  

====

Source code 2

boolean itsWork = SystemClock.setCurrentTimeMillis(1330082817000);  
System.out.println(itsWork);  

Manifest:

<uses-permission android:name="android.permission.SET_TIME" />  
<uses-permission android:name="android.permission.SET_TIME_ZONE" />  

itsWork value:

false  

====

Source code 3

SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd.hhmmss");
String data = format.format(new Date(1330082817000));
try {
    Runtime.getRuntime().exec("date -s " + data);
} catch (IOException e) {
}

What am I doing wrong?

Thanks in advance!

Answer 1

The user application does not have permission to change the device time. Please read the answer by cashbash in the following post for the alternate option.

Copying here for quick reference:

According to this thread, user apps cannot set the time, regardless of the permissions we give it. Instead, the best approach is to make the user set the time manually. We will use:

startActivity(new Intent(android.provider.Settings.ACTION_DATE_SETTINGS));

Unfortunately, there is no way to link them directly to the time setting (which would save them one more click). By making use of ellapsedRealtime, we can ensure that the user sets the time correctly.