I'm not sure I understand what you're trying to achieve. I assume you need the util.Date object for something other than display and are just printing it to help you develop your code?
If you call toDate() on a DateTime, it gives you a java.util.Date with the same number of milliseconds since 1-1-1970 GMT. Problem with java.util.Date is it has no time zone information, and therefore doesn't know you changed that earlier. If you toString() that java.util.Date, it uses the system timezone to print its output, giving you the client's view of the time. If your goal is to print that same moment in time in the server's timezone, use a java.text.DateFormat and call its setTimeZone() method before calling format(). Don't use the toString() method of java.util.Date. I think this is what you're looking for. The thing to keep in mind is that time zones are just "presentation logic" invented because we humans like midnight to be 00:00 wherever we are on the globe. If it's 9pm in London and 10pm in Amsterdam today, it's the same number of milliseconds since 1-1-1970 GMT (or since the Beginning of Time, if you will). When you call withTimeZone() on a DateTime instance, it returns a new instance with the new time zone, but with the originial millisecond value. When you print out that new DateTime, it shows up differently because the zone is different. If you need the time in a different timezone but with the same day/month/year/hour/minute/second numbers, call the withZoneRetainFields() of the DateTime instance. This gives you a new DateTime object with a different number of milliseconds since 1970 (in other words, a different moment in history). This is an uncommon requirement. HTH, Barend On Thu, Apr 23, 2009 at 8:28 AM, suganthi kaliamoorthy <suganth...@yahoo.com> wrote: > > Thanks Barend. > > How the same can be acheived using DateTime? > I did following operations client side with timezone IST. > > >From client side I used withZone, passed server timezone id, to convert > >Datetime object of client timezone(IST) to DateTimeobject of server > >timezone(PST/PDT). I tried printing DateTime and it gave me correct server > >timezone. > > But my ultimate aim is to fetch the date object . So I used > DateTime.toDate(). The resultant gave me client time. Can you please help in > this regard? > > Thanks again. > Suganthi. > > > --- On Thu, 4/23/09, W.B. Garvelink <barend.garvel...@gmail.com> wrote: > >> From: W.B. Garvelink <barend.garvel...@gmail.com> >> Subject: Re: [Joda-interest] Converting Date from one timezone to another >> To: "Discussion of the Joda project" <joda-interest@lists.sourceforge.net> >> Date: Thursday, April 23, 2009, 2:53 AM >> Hi Suganthi, >> >> The java.util.Date object has no timezone information, so >> there is no >> such conversion possible. >> >> Since you're already posting on the Joda-Time mailing >> list, the >> easiest fix is to stop using java.util.Date altogether and >> switch to >> using Joda's DateTime class. >> >> If you're forced to use util.Date (I think there is a >> UN resolution >> against that... there should be), you'll have to carry >> around the time >> zone information in a separate variable and pass it into >> the >> DateFormat before you parse or print a util.Date as String. >> You can >> also use util.Calendar instead of util.Date. The Calendar >> object >> carries a time zone with it, but keep in mind that if you >> use it and >> DateFormat together, you still have to set the time zone on >> the >> DateFormat by hand. It's an error-prone mess, avoid if >> you can. >> >> >> Hope this helps, >> >> Barend >> >> >> >> On Wed, Apr 22, 2009 at 7:54 PM, suganthi kaliamoorthy >> <suganth...@yahoo.com> wrote: >> > >> > Hi, >> > >> > Can someone please help how to convert Date object >> from one timezone to another? >> > >> > I have java.util.Date object with currentTime in one >> zone. Have to convert this to date of different timezone. >> > >> > Thanks, >> > Suganthi. >> > >> >> ------------------------------------------------------------------------------ >> Stay on top of everything new and different, both inside >> and >> around Java (TM) technology - register by April 22, and >> save >> $200 on the JavaOne (SM) conference, June 2-5, 2009, San >> Francisco. >> 300 plus technical and hands-on sessions. Register today. >> Use priority code J9JMT32. http://p.sf.net/sfu/p >> _______________________________________________ >> Joda-interest mailing list >> Joda-interest@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/joda-interest > > > > > > ------------------------------------------------------------------------------ > Stay on top of everything new and different, both inside and > around Java (TM) technology - register by April 22, and save > $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. > 300 plus technical and hands-on sessions. 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