Try the Following Code :
Intent i = new Intent(AlarmClock.ACTION_SET_ALARM);
startActivity(i);
You can also set the alarm by doing something like below :
Intent i = new Intent(AlarmClock.ACTION_SET_ALARM);
i.putExtra(AlarmClock.EXTRA_MESSAGE, "New Alarm");
i.putExtra(AlarmClock.EXTRA_HOUR, 11);
i.putExtra(AlarmClock.EXTRA_MINUTES, 20);
startActivity(i);
You will also need to have the following permission in the manifest :
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
For more information check the content here
Hope this helps!!!