fix datetime error

mobile/src/main/java/de/tudresden/inf/st/sensorsharing/MainActivity.java

@@ -325,13 +325,13 @@ public class MainActivity extends AppCompatActivity implements
                         @Override
                         public void onClick(View view) {
                             sendMqttUpdates.put(MQTT_TOPIC_DATETIME_MONTH,true);
-                            sendUpdate(MQTT_TOPIC_DATETIME_MONTH,getDateTime()[1]);
+                            sendUpdate(MQTT_TOPIC_DATETIME_MONTH,getDateTime()[0]);
                             sendMqttUpdates.put(MQTT_TOPIC_DATETIME_DAY,true);
-                            sendUpdate(MQTT_TOPIC_DATETIME_DAY,getDateTime()[2]);
+                            sendUpdate(MQTT_TOPIC_DATETIME_DAY,getDateTime()[1]);
                             sendMqttUpdates.put(MQTT_TOPIC_DATETIME_HOUR,true);
-                            sendUpdate(MQTT_TOPIC_DATETIME_HOUR,getDateTime()[3]);
+                            sendUpdate(MQTT_TOPIC_DATETIME_HOUR,getDateTime()[2]);
                             sendMqttUpdates.put(MQTT_TOPIC_DATETIME_MINUTE,true);
-                            sendUpdate(MQTT_TOPIC_DATETIME_MINUTE,getDateTime()[4]);
+                            sendUpdate(MQTT_TOPIC_DATETIME_MINUTE,getDateTime()[3]);
                             //send preferences
                             String userBrightness= drop2.getSelectedItem().toString();
                             System.out.println(userBrightness);
@@ -371,7 +371,7 @@ public class MainActivity extends AppCompatActivity implements
 
  //get input datas from mobil in system month
     private String [] getDateTime(){
-        DateFormat df = new SimpleDateFormat("yy:MM:dd:HH:mm");
+        DateFormat df = new SimpleDateFormat("MM:dd:HH:mm");
         String date = df.format(Calendar.getInstance().getTime());
         String[] datetime_split= new String[5];
         datetime_split=date.split(":");