On 8/15/16 7:33 AM, Andreas 'ads' Scherbaum wrote:
> postgres=# SELECT to_date('2011 12 18', 'YYYY MM DD');
> to_date
> ------------
> 2011-12-08
> (1 row)
>
>
> That is from the regression tests, and obviously handles the date
> transformation wrong. My attempt catches this, because I compare the
> date with the input date, and do not rely on a valid date only.
It's debatable what is correct here.
Using to_number, the behavior appears to be that a space in the pattern
ignores one character. For example:
test=# select to_number('123 456', '999 999');to_number
----------- 123456
test=# select to_number('123 456', '999 999');to_number
----------- 12356
Considering that, the above to_date result is not incorrect.
So just squashing the spaces and converting the value back is not a
correct approach to detecting overflow.
I think using ValidateDate() was the right idea. That is what we use
for checking date validity everywhere else.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
