docs: protected void buildBeginTimeIfNeeds(StringBuilder sb) {
          final Object beginTime = findBeginTime();
          if (beginTime != null) {
              sb.append(LF).append(" beginTime: ");
              final String beginExp;
              if (beginTime instanceof LocalDateTime) { // basically here
                  beginExp = beginTimeFormatter.format((LocalDateTime) beginTime);
              } else { // no way, just in case
                  beginExp = beginTime.toString();
              }
              sb.append(beginExp);
          }
      }