DanInDC DanInDC - 6 months ago 20
Java Question

simpledateformat parsing date with 'Z' literal

I am trying to parse a date that looks like this:

2010-04-05T17:16:00Z


This is a valid date per http://www.ietf.org/rfc/rfc3339.txt. The 'Z' literal "imply that UTC
is the preferred reference point for the specified time."

If I try to parse it using SimpleDateFormat and this pattern:

yyyy-MM-dd'T'HH:mm:ss


It will be parsed as a Mon Apr 05 17:16:00 EDT 2010

SimpleDateFormat is unable to parse the string with these patterns:

yyyy-MM-dd'T'HH:mm:ssz
yyyy-MM-dd'T'HH:mm:ssZ


I can explicitly set the TimeZone to use on the SimpleDateFormat to get the expected output, but I don't think that should be necessary. Is there something I am missing? Is there an alternative date parser?

Answer

In the pattern, the inclusion of a 'z' date-time component indicates that timezone format needs to conform to the General time zone "standard", examples of which are Pacific Standard Time; PST; GMT-08:00.

A 'Z' indicates that the timezone conforms to the RFC 822 time zone standard, e.g. -0800.

I think you need a DatatypeConverter ...

@Test
public void testTimezoneIsGreenwichMeanTime() throws ParseException {
    final Calendar calendar = javax.xml.bind.DatatypeConverter.parseDateTime("2010-04-05T17:16:00Z");
    TestCase.assertEquals("gotten timezone", "GMT+00:00", calendar.getTimeZone().getID());
}
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