Re: to_char(timestamp, format) is changing the year!

On Nov 30, 2014, at 1:05 PM, Stephen Woodbridge  wrote:

> Hi,
> 
> I am have a problem when I format a timestamp in that it is changing the year. This can't be right, so either I don't understand

You're using "IYYY" which is the "ISO year", which is based on Mondays or Thursdays or something equally useless. You probably want "YYYY" instead.

Cheers,
  Steve

> or I have found a nasty corner case bug.
> 
> This does not happen on all dates
> 
> select '2014-12-31 00:00:00'::timestamp without time zone,
>       to_char('2014-12-31 00:00:00'::timestamp without time zone, 'IYYY-MM-DD HH24:MI:SS');
> 
> "2014-12-31 00:00:00";"2015-12-31 00:00:00"
> 
> It appears that this also happens for all timestamps after "2014-12-28 23:59:59" to the end of the year and then "2015-01-01 00:00:00" is ok again.
> 
> I have found this on 9.2 and 9.3.
> 
> "PostgreSQL 9.2.9 on x86_64-unknown-linux-gnu, compiled by gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, 64-bit"
> 
> "PostgreSQL 9.3.5 on x86_64-unknown-linux-gnu, compiled by gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, 64-bit"
> 
> Any thoughts on how to work around this?
> 
> Thanks,
>  -Steve
> 
> 
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