code: protected String buildRememberMeCookieValue(USER_ENTITY userEntity, USER_BEAN userBean, int expireDays) {
          final String autoLoginKey = createRememberMeKey(userEntity, userBean);
          final String delimiter = getRememberMeDelimiter();
          final HandyDate currentHandyDate = timeManager.currentHandyDate();
          final HandyDate expireDate = currentHandyDate.addDay(expireDays); // access token's expire
          return autoLoginKey + delimiter + formatForRememberMeExpireDate(expireDate);
      }
docs: Build the value for remember-me saved in cookie. <br>
  You can change access token's structure by override. #change_access_token
  @param userEntity The selected entity of login user. (NotNull)
  @param userBean The user bean saved in session. (NotNull)
  @param expireDays The count of expired days from current times. (NotNull)
  @return The string value for remember-me. (NotNull)