Java Date XML Format getTime(String xmlDateTime)

Description

Gets the time, in milliseconds, from an XML date time string as defined at http://www.w3.org/TR/xmlschema-2/#dateTime

License

Open Source License

Parameter

Parameter	Description
xmlDateTime	the XML date time string

Declaration

public static long getTime(String xmlDateTime) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final SimpleDateFormat ISO_8601_BASE = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
    private static final Pattern ISO_8601_EXTRAS = Pattern.compile("^(\\.\\d+)?(?:Z|([+-])(\\d{2}):(\\d{2}))?$");

    /**//from  w w w . j a  v  a2  s.  c  om
     * Gets the time, in milliseconds, from an XML date time string as defined
     * at http://www.w3.org/TR/xmlschema-2/#dateTime
     * 
     * @param xmlDateTime
     *            the XML date time string
     */
    public static long getTime(String xmlDateTime) {
        // Parse the date time base
        ParsePosition position = new ParsePosition(0);
        Date date = ISO_8601_BASE.parse(xmlDateTime, position);
        if (date == null) {
            throw new IllegalArgumentException("Invalid XML dateTime value: " + xmlDateTime + " (at position "
                    + position.getErrorIndex() + ")");
        }

        // Parse the date time extras
        Matcher matcher = ISO_8601_EXTRAS.matcher(xmlDateTime.substring(position.getIndex()));
        if (!matcher.matches()) {
            // This will match even an empty string as all groups are optional.
            // Thus a
            // non-match means invalid content.
            throw new IllegalArgumentException("Invalid XML dateTime value: " + xmlDateTime);
        }

        long time = date.getTime();

        // Account for fractional seconds
        String fractional = matcher.group(1);
        if (fractional != null) {
            // Regex ensures fractional part is in (0,1)
            float fractionalSeconds = Float.parseFloat(fractional);
            long fractionalMillis = (long) (fractionalSeconds * 1000.0f);
            time += fractionalMillis;
        }

        // Account for timezones
        String sign = matcher.group(2);
        String offsetHoursStr = matcher.group(3);
        String offsetMinsStr = matcher.group(4);
        if (sign != null && offsetHoursStr != null && offsetMinsStr != null) {
            // Regex ensures sign is + or -
            boolean plusSign = sign.equals("+");
            int offsetHours = Integer.parseInt(offsetHoursStr);
            int offsetMins = Integer.parseInt(offsetMinsStr);

            // Regex ensures values are >= 0
            if (offsetHours > 14 || offsetMins > 59) {
                throw new IllegalArgumentException("Bad timezone: " + xmlDateTime);
            }

            long totalOffsetMillis = (offsetMins + offsetHours * 60L) * 60000L;

            // Convert to UTC
            if (plusSign) {
                time -= totalOffsetMillis;
            } else {
                time += totalOffsetMillis;
            }
        }
        return time;
    }
}

Related

1. formatDateToXML(Date dateTime)
2. formatToXMLDate(Date date)
3. formatXml(Date date)
4. formatXMLDate(Date date, String pattern)
5. getXmlTime(Date date)
6. parse(String xmlDateTime)
7. toXMLDateTime(final Date date)
8. xml2Date(String xmlDate)