Notification в определенное время

public void restartNotify(Context context) {
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent notifyIntent = new Intent(context, TimeNotification.class);
        PendingIntent contentIntent = PendingIntent.getBroadcast(this, 0,
                notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT );
 
        Calendar calendar = Calendar.getInstance();
        Calendar cal = Calendar.getInstance();
 
        calendar.set(Calendar.YEAR, cal.get(Calendar.YEAR));
        calendar.set(Calendar.MONTH, cal.get(Calendar.MONTH));
        calendar.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH));
        calendar.set(Calendar.HOUR_OF_DAY, 21);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
 
        alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), contentIntent);
    }

public class TimeNotification extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(R.drawable.logo, "Test", System.currentTimeMillis());
        Intent intentTL = new Intent(context, MainActivity.class);
        notification.setLatestEventInfo(context, "Test", "Do something!",
                PendingIntent.getActivity(context, 0, intentTL,
                        PendingIntent.FLAG_CANCEL_CURRENT));
        notification.flags = Notification.DEFAULT_LIGHTS | Notification.FLAG_AUTO_CANCEL;
        nm.notify(1, notification);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
                intent, PendingIntent.FLAG_CANCEL_CURRENT);
        alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + AlarmManager.INTERVAL_DAY, pendingIntent);
    }
}