Re: Date conversion using day of week - Mailing list pgsql-general

On Tuesday, March 29, 2011 8:33:59 am Steve Crawford wrote:
> 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


Yes and no:)

test(5432)aklaver=>select to_date('2011-13-MON', 'IYYY-IW-DY');
  to_date
------------
 2011-03-28
(1 row)

test(5432)aklaver=>select to_date('2011-13-SUN', 'IYYY-IW-DY');
  to_date
------------
 2011-03-28
(1 row)



--
Adrian Klaver
adrian.klaver@gmail.com