code: protected String createSendTime(final Date sendTime) {
      if (sendTime == null || new Date(System.currentTimeMillis() + 1000L * 60L).after(sendTime)) {
        return null;
      }
      String customSendTimePattern =
          StringUtils.isBlank(this.sendTimePattern) ? DEFAULT_SEND_TIME_PATTERN
              : this.sendTimePattern;
      SimpleDateFormat sdf = new SimpleDateFormat(customSendTimePattern, Locale.GERMANY);
      sdf.setTimeZone(TimeZone.getTimeZone("Europe/Berlin"));
      return sdf.format(sendTime);
    }
docs: Creates the send time URL parameter value.
  
  @param sendTime the send time as {@link Date}
  @return the send time URL parameter value