@Override public String toString() {
        return new StringBuilder()
            .append("{\n")
            .append("\"text\":\"").append(getText()).append("\",\n")
            .append("\"startValue\":").append(getStart()).append(",\n")
            .append("\"stopValue\":").append(getStop()).append(",\n")
            .append("\"color\":\"").append(getColor().toString().substring(0,8).replace("0x", "#")).append("\",\n")
            .append("\"highlightColor\":\"").append(getHighlightColor().toString().substring(0,8).replace("0x", "#")).append("\",\n")
            .append("\"textColor\":\"").append(getTextColor().toString().substring(0,8).replace("0x", "#")).append("\"\n")
            .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