On 03/29/2011 08:07 AM, Marc Munro wrote:
I'm trying to validate a day of the week, and thought that to_date would
do the job for me.  But I found a case where it cannot tell the
difference between sunday and monday.  Is this a bug or intended
behaviour?

dev=# select to_date('2011-13-Mon', 'YYYY-IW-DY');
   to_date
------------
  2011-03-28

Based on running the queries in 9.0, it's behavior that has been corrected:

select to_date('Mon1-13-Tue', 'YYYY-IW-DY');
ERROR:  invalid combination of date conventions
HINT: Do not mix Gregorian and ISO week date conventions in a formatting template.

Cheers,
Steve


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