public String getStyleOfDate(UTCDate date) {
        return styler.getStyleName(date);
    }
Gets the style associated with a date (does not include styles set via
{@link #addTransientStyleToDates}).

@param date the date
@return the styles associated with this date
stroom-core-client-widget/src/main/java/stroom/widget/datepicker/client/CustomDatePicker.java