code: private static void storeAskLaterDate(final Context context) {
          SharedPreferences pref = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
          Editor editor = pref.edit();
          editor.putLong(KEY_ASK_LATER_DATE, System.currentTimeMillis());
          editor.apply();
      }
docs: Store the date the user asked for being asked again later.
  @param context