Re: to_date()/to_timestamp() silently accept month=0 and day=0

Hi,

On Thu, 23 Apr 2026 at 13:41, Daniel Gustafsson <daniel(at)yesql(dot)se> wrote:

> > On 23 Apr 2026, at 09:57, Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
> > Perhaps we could consider strengthening such inputs on HEAD once v20
> > opens for business? It would be really a scary thing to backpatch,
> > still a major release is a different thing.
>
> This could definitely not be backpatched IMO, a quick check in v14 shows
> the
> same behaviour. The gregorian calendar goes from BC1 to AD1 and does not
> define a year 0, to_date('0000','YYYY') correctly returns year 0001,
> handling
> months/days in the same way at least makes it consistent (though I didn't
> scour
> the archives to see if it was intentionally done like that).
>
>
++ on not backporting it since it may break existing applications.

But we should consider strengthening such inputs for v20.

Regards,
Ayush