Re: problem with dates when using a java calendar object with

Hi Dave,
Thanks for your reply.

Dave Cramer wrote:

> As Kris already pointed out you can use the calendar specified by the
> user now; if you download the development driver.

I have used the following drivers in my test program: pg72jdbc2.jar,
pgdev.306.jdbc2.jar and pgdev.306.jdbc3.jar. All of them presented the
problem but with different time errors. The test results are above. I am
using a DateFormat to print dates. The DateFormat object is
appropriately configured for my timezone and calendar. Any other ideas? :-)

Using driver: pg72jdbc2.jar
date (0) inserted: 16/10/04 00:00
date (1) inserted: 16/10/04 23:59
date (2) inserted: 16/10/04 08:00
date (3) inserted: 16/10/04 19:00
date (0) loaded: 15/10/04 17:00
date (1) loaded: 16/10/04 17:00
date (2) loaded: 15/10/04 17:00
date (3) loaded: 16/10/04 17:00

Using driver: pgdev.306.jdbc2.jar
date (0) inserted: 16/10/04 00:00
date (1) inserted: 16/10/04 23:59
date (2) inserted: 16/10/04 08:00
date (3) inserted: 16/10/04 19:00
date (0) loaded: 15/10/04 10:00
date (1) loaded: 16/10/04 10:00
date (2) loaded: 15/10/04 10:00
date (3) loaded: 16/10/04 10:00

Using driver: pgdev.306.jdbc3.jar
date (0) inserted: 16/10/04 00:00
date (1) inserted: 16/10/04 23:59
date (2) inserted: 16/10/04 08:00
date (3) inserted: 16/10/04 19:00
date (0) loaded: 15/10/04 10:00
date (1) loaded: 16/10/04 10:00
date (2) loaded: 15/10/04 10:00
date (3) loaded: 16/10/04 10:00

Thanks,
Jair Jr

>
> Dave
>
> Jair da Silva Ferreira Jr wrote:
>
>> Hi Markus,
>> Thank you very much for your reply.
>>
>> Markus Schaber wrote:
>>
>>> Hi, Jair,
>>>
>>> On Thu, 14 Oct 2004 11:41:21 -0300
>>> Jair da Silva Ferreira Jr <j2(at)amazon(dot)com(dot)br> wrote:
>>>
>>>
>>>
>>>> My test table definition is: create table date_test (d date)
>>>> As you can see it is a date type, so there's no time zone
>>>> information on it.
>>>> Do you think that the date not having time zone information is the
>>>> source of the problem? If yes, what time zone should I use so that
>>>> dates are correctly inserted and selected? UTC time zone? The
>>>> default JVM timezone?
>>>>
>>>
>>>
>>>
>>> It is possible that this is the source of your problem.
>>>
>>> Table columns with time zone always remember the time zone of the dates
>>> stored, while the table columns without time zone convert your date to
>>> UTC and forget the original time zone.
>>>
>>> This had to be changed at postgres level. Just test whether manually
>>> inserting dates (e. G. via psql) and then re-reading works.
>>>
>>>
>> I inserted dates via pgsql and selected them via Java and the
>> problem remains. I keep getting wrong days in my date. I think the
>> JDBC driver is somehow considering the current jvm timezone to
>> calculate dates. I think this is wrong because I am providing a
>> user-defined Calendar exactly not to use the jvm default.
>> I analysed the AbstractJdbc2Statement.java and
>> AbstractJdbc2ResultSet.java source code and I noticed that the driver
>> transforms the date in a String and them inserts it into the
>> database. Maybe the problem is how the String is being generated. I
>> think the best solution is to use a java.text.DateFormat object with
>> the calendar specified by the user set on it. This DateFormat object
>> could be used to both insert and select the date value from the
>> database because it has a format(Date) and parse(Date) method. What
>> do you think?
>>
>> Thanks,
>> Jair Jr
>>
>>
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>