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    <p>Unfortunately, the time zone formats available to <a href="http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html" rel="noreferrer">SimpleDateFormat</a> (Java 6 and earlier) are not <a href="https://en.wikipedia.org/wiki/ISO_8601" rel="noreferrer">ISO 8601</a> compliant. SimpleDateFormat understands time zone strings like "GMT+01:00" or "+0100", the latter according to <a href="http://www.ietf.org/rfc/rfc0822.txt" rel="noreferrer" title="STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGES">RFC # 822</a>.</p> <p>Even if Java 7 added support for time zone descriptors according to ISO 8601, SimpleDateFormat is still not able to properly parse a complete date string, as it has no support for optional parts.</p> <p>Reformatting your input string using regexp is certainly one possibility, but the replacement rules are not as simple as in your question:</p> <ul> <li>Some time zones are not full hours off <a href="https://en.wikipedia.org/wiki/Coordinated_Universal_Time" rel="noreferrer">UTC</a>, so the string does not necessarily end with ":00".</li> <li>ISO8601 allows only the number of hours to be included in the time zone, so "+01" is equivalent to "+01:00"</li> <li>ISO8601 allows the usage of "Z" to indicate UTC instead of "+00:00".</li> </ul> <p>The easier solution is possibly to use the data type converter in JAXB, since JAXB must be able to parse ISO8601 date string according to the XML Schema specification. <code>javax.xml.bind.DatatypeConverter.parseDateTime("2010-01-01T12:00:00Z")</code> will give you a <code>Calendar</code> object and you can simply use getTime() on it, if you need a <code>Date</code> object.</p> <p>You could probably use <a href="http://www.joda.org/joda-time/" rel="noreferrer">Joda-Time</a> as well, but I don't know why you should bother with that.</p>
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    1. POConverting ISO 8601-compliant String to java.util.Date
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    1. POConverting ISO 8601-compliant String to java.util.Date
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    1. COThe JAXB-solution is a really creative approach! It works as well, I have tested it with my sample. However, for whoever faces the problem and is allowed to use JodaTime, I would advise to use it, since it feels more natural. But your solution requires not additional libraries (at least with Java 6).
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    2. COHere's the reverse: Calendar c = GregorianCalendar.getInstance();c.setTime(aDate);return javax.xml.bind.DatatypeConverter.printDateTime(c);
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      1. USAlexander Ljungberg
    3. COWow, that's a really non-obvious place to put such a useful thing. Been searching for a few days.
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