RE: Use of CURRENT_DATE vs SYSDATE and DST

SYSDATE reports the time from the OS.  

CURRENT_DATE is based on the session's time_zone. (Alter session set time_zone='...')  

-- 
Mark J. Bobak 
Senior Oracle Architect 
ProQuest/CSA 

"There are 10 types of people in the world:  Those who understand
binary, and those who don't." 

 



________________________________


From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mercadante, Thomas F
(LABOR)
Sent: Thursday, March 22, 2007 3:19 PM
To: oracle-l_at_freelists.org
Subject: Use of CURRENT_DATE vs SYSDATE and DST



All,

I had a developer ask me a question today that I missed in our
discussion regarding the DST patches.  He showed me where:

SQL> select to_char(sysdate,'mm/dd/yyyy hh24:mi:ss'),

  2  to_char(current_date,'mm/dd/yyyy hh24:mi:ss')

  3  from dual;

Sysdate                   Current Date

----------------------------- -----------------------------

03/22/2007 15:14:24 03/22/2007 16:14:25

So after patching my database with the current DST patch (and not
patching the client), the value of CURRENT_DATE is incorrect - it is
15:14 right now.  And what the heck does CURRENT_DATE return?  One hour
ahead?  I would expect it to be one hour behind (at 14:14) until the end
of March.

Does this make sense?  And when I applied the client patches, the value
of CURRENT_DATE did not change???

I told my developer to not use CURRENT_DATE - stick to SYSDATE.


Tom



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