Brian,
Thank you for your explanation. I will try to solve the problem using the
GJChronology.
In general I feel that my expectation is mislead by providing a toDate method
that returns a java.util.Date object that contains a different date than the
DateTime object.
I could also not find a hint on the problematic in the Java code (JavaDocs).
My expectation is that a method toDate returning a java.util.Date should be
able to return the correct object. If Joday Time knows about the different
calendars, why not internally adjust and correct the difference rather than
move the burden to the user. Or not providing a toDate at all.
Andreas
From: Brian O'Neill [mailto:[EMAIL PROTECTED]
Sent: Monday, November 10, 2008 5:33 PM
To: Discussion of the Joda project
Subject: Re: [Joda-interest] Problem with DateTime toDate - java.util.Date
returns different date
Joda-Time by default uses an ISO chronology, which is a proleptic gregorian
calendar. Java's Date class uses a gregorian/julian calendar which has a gap of
several days to account for the error between the two. If you want the two
representations to be the same, you need to use Joda-Time's GJChronology.
Other differences are caused by how the time zone rules are implemented.
Joda-Time strictly follows the tz database rules, which is why you see
differences before 1884.
If you want to support historical datetimes in a consistent fashion, the
easiest thing is to not switch between Joda-Time and Java Date.
On Mon, Nov 10, 2008 at 4:36 PM, Andreas Guther <[EMAIL
PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Hi,
I noticed a converting problem from DateTime to java.util.Date. Dates in the
past seem to be off by one or more days, depending on how far those dates are
in the past. My observation is, that dates until 1884 are fine, but before are
starting to be off by one day. Is there something I have to configure. It is
hard to believe that this is a bug.
public static void main(String[] args) {
DateTimeFormatter fmt = DateTimeFormat.forPattern("MM/dd/yyyy");
DateTime dateTime = fmt.parseDateTime("10/11/1492");
System.out.println(dateTime);
// prints 1492-10-11T00:00:00.000-07:52:58 - AS EXPECTED
System.out.println(dateTime.toDate());
// prints Mon Oct 01 23:52:58 PST 1492 - MONTH OK, BUT DAY WAY OFF!!!!
}
We are currently using joda-time 1.5.2.<http://1.5.2.>
Andreas
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