joda time, time zone

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DateTime dt = new DateTime(DateTimeZone.forOffsetHours(8));
   
dt=dt.withZone(DateTimeZone.forOffsetHours(-5));
   
DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ssZZ");
   
System.out.println(dtf.print(dt));
   
String s="2012-06-27T20:00:00+08:00";
   
DateTime dt2= dtf.parseDateTime(s) ;
   
System.out.println(dtf.print(dt2));