freemarker-core/src/main/java/freemarker/template/utility/DateUtil.java [464:487]:
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            Matcher m, TimeZone defaultTZ,
            boolean xsMode,
            CalendarFieldsToDateConverter calToDateConverter) 
            throws DateParseException {
        NullArgumentException.check("defaultTZ", defaultTZ);
        try {
            int year = groupToInt(m.group(1), "year", Integer.MIN_VALUE, Integer.MAX_VALUE);
            
            int era;
            // Starting from ISO 8601:2000 Second Edition, 0001 is AD 1, 0000 is BC 1, -0001 is BC 2.
            // However, according to http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/, XML schemas are based
            // on the earlier version where 0000 didn't exist, and year -1 is BC 1.
            if (year <= 0) {
                era = GregorianCalendar.BC;
                year = -year + (xsMode ? 0 : 1);
                if (year == 0) {
                    throw new DateParseException(MSG_YEAR_0_NOT_ALLOWED);
                }
            } else {
                era = GregorianCalendar.AD;
            }
            
            int month = groupToInt(m.group(2), "month", 1, 12) - 1;
            int day = groupToInt(m.group(3), "day-of-month", 1, 31);
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freemarker-core/src/main/java/freemarker/template/utility/DateUtil.java [630:653]:
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            Matcher m, TimeZone defaultTZ,
            boolean xsMode,
            CalendarFieldsToDateConverter calToDateConverter) 
            throws DateParseException {
        NullArgumentException.check("defaultTZ", defaultTZ);
        try {
            int year = groupToInt(m.group(1), "year", Integer.MIN_VALUE, Integer.MAX_VALUE);
            
            int era;
            // Starting from ISO 8601:2000 Second Edition, 0001 is AD 1, 0000 is BC 1, -0001 is BC 2.
            // However, according to http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/, XML schemas are based
            // on the earlier version where 0000 didn't exist, and year -1 is BC 1.
            if (year <= 0) {
                era = GregorianCalendar.BC;
                year = -year + (xsMode ? 0 : 1);
                if (year == 0) {
                    throw new DateParseException(MSG_YEAR_0_NOT_ALLOWED);
                }
            } else {
                era = GregorianCalendar.AD;
            }
            
            int month = groupToInt(m.group(2), "month", 1, 12) - 1;
            int day = groupToInt(m.group(3), "day-of-month", 1, 31);
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