public String getTimeSeparator() {
        if (timeSeparator == null) {
            // #5528 Determine separator for locale
            Locale locale = calculateLocale(getFacesContext());
            String localePattern = DateTimeFormatterBuilder.getLocalizedDateTimePattern(null, FormatStyle.SHORT, IsoChronology.INSTANCE, locale);
            timeSeparator = localePattern.contains(":") ? ":" : ".";
        }
        return timeSeparator;
    }
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