public String getFractionSeparator() {
        if (fractionSeparator == null) {
            // Determine separator for locale
            Locale locale = calculateLocale(getFacesContext());
            char ds = ((DecimalFormat) NumberFormat.getInstance(locale)).getDecimalFormatSymbols().getDecimalSeparator();
            fractionSeparator = Character.toString(ds);
        }
        return fractionSeparator;
    }
Standard 576px considered a small screen so we can auto switch the picker to touch mode
primefaces/src/main/java/org/primefaces/component/datepicker/DatePickerBase.java