docs: protected static String instantToStringTime(Instant instant) {
      	String result = "";
      	if (instant!=null) { 
      		StringBuffer time = new StringBuffer();
      		time.append(String.format("%02d",instant.get(DateTimeFieldType.hourOfDay())));
      		time.append(":").append(String.format("%02d",instant.get(DateTimeFieldType.minuteOfHour())));
      		time.append(":").append(String.format("%02d",instant.get(DateTimeFieldType.secondOfMinute())));
      		time.append(".").append(String.format("%03d",instant.get(DateTimeFieldType.millisOfSecond())));
      		String timeZone = instant.getZone().getID();
      		if (timeZone.equals("UTC")) { 
      		    time.append("Z"); 
      		} else { 
      			time.append(timeZone);
      		}
      		result = time.toString();
      	}
      	return result;
      }