Hi,

You app can obtain correct time from Location API or GPS 
http://developer.android.com/training/location/index.html or NTP 
eg: https://github.com/Free-Software-for-Android/NTPSync

Regards

On Wednesday, April 20, 2016 at 6:31:27 PM UTC+10, Tafadzwa Innocent 
Chin'ombe wrote:
>
>
> public class MainMenuActivity extends ListActivity {
>
>    private static final String TAG = MainMenuActivity.class.getSimpleName();
>
>    @Override
>    protected void onCreate(Bundle savedInstanceState) {
>         super.onCreate(savedInstanceState);
>         setContentView(R.layout.activity_main_menu);
>       try {
>
>          //insure device date time is correct before app opens
>          String ServerDate=  "";
>          String DeviceDateTime "";
>
> //if date & time correct opens else show a message corect device date time
>
>

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