https://xerces.apache.org/xerces2-j/: Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use. 
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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
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 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.xerces.impl.dv.xs;

import java.math.BigInteger;

import javax.xml.datatype.DatatypeConstants;
import javax.xml.datatype.XMLGregorianCalendar;

import org.apache.xerces.impl.dv.InvalidDatatypeValueException;
import org.apache.xerces.impl.dv.ValidationContext;


Validator for <dateTime> datatype (W3C Schema Datatypes)

Author:Elena Litani, Gopal Sharma, SUN Microsystem Inc.
@xerces.internal
Version:$Id: DateTimeDV.java 937741 2010-04-25 04:25:46Z mrglavas $
/**
 * Validator for &lt;dateTime&gt; datatype (W3C Schema Datatypes)
 *
 * @xerces.internal 
 *
 * @author Elena Litani
 * @author Gopal Sharma, SUN Microsystem Inc.
 *
 * @version $Id: DateTimeDV.java 937741 2010-04-25 04:25:46Z mrglavas $
 */
public class DateTimeDV extends AbstractDateTimeDV {

    public Object getActualValue(String content, ValidationContext context) throws InvalidDatatypeValueException {
        try{
            return parse(content);
        } catch(Exception ex){
            throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "dateTime"});
        }
    }

    
Parses, validates and computes normalized version of dateTime object

Params:
  • str –    The lexical representation of dateTime object CCYY-MM-DDThh:mm:ss.sss
              with possible time zone Z or (-),(+)hh:mm
Throws:
Returns:normalized dateTime representation
/**
     * Parses, validates and computes normalized version of dateTime object
     *
     * @param str    The lexical representation of dateTime object CCYY-MM-DDThh:mm:ss.sss
     *               with possible time zone Z or (-),(+)hh:mm
     * @return normalized dateTime representation
     * @exception SchemaDateTimeException Invalid lexical representation
     */
    protected DateTimeData parse(String str) throws SchemaDateTimeException {
        DateTimeData date = new DateTimeData(str, this);
        int len = str.length();

        int end = indexOf (str, 0, len, 'T');

        // both time and date
        int dateEnd = getDate(str, 0, end, date);
        getTime(str, end+1, len, date);

        //Check the separator character between Date and Time
        if (dateEnd != end) {
            throw new RuntimeException(str
                    + " is an invalid dateTime dataype value. "
                    + "Invalid character(s) seprating date and time values.");
        }

        //validate and normalize

        //REVISIT: do we need SchemaDateTimeException?
        validateDateTime(date);

        //save unnormalized values
        saveUnnormalized(date);
        
        if (date.utc!=0 && date.utc!='Z') {
            normalize(date);
        }
        return date;
    }
    
    protected XMLGregorianCalendar getXMLGregorianCalendar(DateTimeData date) {
        return datatypeFactory.newXMLGregorianCalendar(BigInteger.valueOf(date.unNormYear), date.unNormMonth, 
                date.unNormDay, date.unNormHour, date.unNormMinute, 
                (int)date.unNormSecond, date.unNormSecond != 0 ? getFractionalSecondsAsBigDecimal(date) : null, 
                date.hasTimeZone() ? (date.timezoneHr * 60 + date.timezoneMin) : DatatypeConstants.FIELD_UNDEFINED);
    }
}