Establecer la fecha / hora de Android mediante programación

Necesito establecer la fecha y hora de Android de forma programática, pero no estoy teniendo éxito! Tengo estas tres fuentes arriba:

Código fuente 1

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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" /> 

Excepción:

 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 

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Código fuente 2

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

Manifiesto:

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

Su valor de trabajo

 false 

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Código fuente 3

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

¿Qué estoy haciendo mal?

¡Gracias por adelantado!

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