Is Oct 20th the daylight savings cutover date? Does 00:00 actually exist
on that day? If not, then DateTime cannot represent it, as it only
represents valid date-times.
Stephen
Matt Krevs wrote:
> Hi all
>
> I'm having trouble working out how to set a date to midnight. It seems
> that some timezone issues are causing me problems when I create
> DateTime variable, and I'm a bit stumped regarding what I am doing
> wrong.
>
> When I run my class DateTes, I get the following output
>
> Timezone is
> sun.util.calendar.ZoneInfo[id="Australia/Sydney",offset=36000000,dstSavings=3600000,useDaylight=true,transitions=142,lastRule=java.util.SimpleTimeZone[id=Australia/Sydney,offset=36000000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=9,startDay=1,startDayOfWeek=1,startTime=7200000,startTimeMode=1,endMode=3,endMonth=3,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=1]]
>
> date is Mon Oct 20 02:00:00 EST 2008
> dt is 2008-10-20T01:00:00.000+10:00
> dt toDate Mon Oct 20 02:00:00 EST 2008
> midnightDateTime is 2008-10-20T00:00:00.000+10:00
> midnightDateTime toDate is Mon Oct 20 01:00:00 EST 2008
> midnightDate is Mon Oct 20 01:00:00 EST 2008
>
> Basically I want to change the dat Mon Oct 20 02:00:00 EST 2008 to Mon
> Oct 20 00:00:00 EST 2008
>
> When I create the DateTime variable though, it looks like some funky
> timezone change occurs and it stores the date using a different
> timezone? and a time of 1:00, so when I set the time to 0:00 it only
> subtracts one hour. When I convert the DateTime back into a date i End
> up with Mon Oct 20 01:00:00 EST 2008
>
> Can anyone help me out? How can I make jodatime preserve timezone data
> so the DateTime variable has the same hour value (ie 2 oclock) as the
> original java.util.Date variable?
>
> Thanks
>
> My class:
>
> import java.util.Date;
> import java.util.TimeZone;
>
> import org.joda.time.DateTime;
>
> public class DateTest {
>
> public static void main(String args[]) {
>
> System.out.println("Timezone is " + TimeZone.getDefault());
> // 20 Oct 2008 2:00:00
> Date date = new Date(108, 9, 20, 2, 0, 0);
> System.out.println("date is " + date.toString());
>
> DateTime dt = new DateTime(date.getTime());
> System.out.println("dt is " + dt.toString());
> System.out.println("dt toDate " + dt.toDate().toString());
>
> DateTime midnightDateTime = dt.withTime(0, 0, 0, 0);
> System.out.println("midnightDateTime is " +
> midnightDateTime.toString());
> System.out.println("midnightDateTime toDate is " +
> midnightDateTime.toDate().toString());
>
> Date midnightDate = midnightDateTime.toDate();
> System.out.println("midnightDate is " + midnightDate.toString());
> }
> }
>
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