public String toJSONString() {
        return new StringBuilder().append("{")
                                  .append("\"start\":").append(getStart().toString()).append(",")
                                  .append("\"stop\":").append(getStop().toString()).append(",")
                                  .append("\"color\":\"").append(getColor().toString().replace("0x", "#")).append("\",")
                                  .append("\"highlightColor\":\"").append(getHighlightColor().toString().replace("0x", "#")).append("\",")
                                  .append("\"active\":").append(isActive()).append(",")
                                  .append("\"text\":\"").append(getText()).append("\",")
                                  .append("\"textColor\":").append(getTextColor().toString().replace("0x", "#")).append("\"")
                                  .append("}")
                                  .toString();
    }
Checks if the section days contains the day of week of the given ZonedDateTime
object and if the section contains the time itself. With this one can react if
a time "enters"/"leaves" a section.
@param DATE_TIME
src/main/java/eu/hansolo/tilesfx/TimeSection.java