Disclaimer: I have not worked with Oracle in a while, so I am just forwarding 
some posts (unverified).

The analysis in this post seems to suggest that the problem is associated with 
the Oracle 11g JDBC driver. 

        
http://stackoverflow.com/questions/22305466/oracle-date-compare-broken-because-of-dst

 The recommendations appears to be to upgrade to 12c (which appears to be 
“New!!” :) )

        
http://www.oracle.com/technetwork/database/features/jdbc/index-091264.html

As I said, I have not personally verified this.
HTH,
Joe



> On Jul 31, 2015, at 1:25 PM, Andrus Adamchik <and...@objectstyle.org> wrote:
> 
>> We found a possibility in setting a certain timezone on the java connection.
> 
> Could you show an example of this?
> 
> 
>> On Jul 31, 2015, at 5:18 PM, Markus Reich <markus.re...@markusreich.at> 
>> wrote:
>> 
>> Hi,
>> 
>> we've some problems with oracle and timzone in combination with daylight
>> savings :-(
>> When I search the web to this topic, I can see that we are not the only one
>> having problems concerning oracle and daylight saving ;-)
>> But it seems that there's no proper solution to fix it :-(
>> 
>> We found a possibility in setting a certain timezone on the java connection.
>> My question what would be the best solution in cayenne to set the timezone
>> on the based java connection object?
>> 
>> br
>> Meex
> 

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