| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> |
| Cc: | "Watzinger, Alexander" <Alexander(dot)Watzinger(at)oeaw(dot)ac(dot)at>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Support for dates before 4713 BC |
| Date: | 2022-09-12 15:53:25 |
| Message-ID: | 1655012.1662998005@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> writes:
> On Mon, 12 Sept 2022 at 16:00, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> No, it applies because we aren't sure that the math would operate
>> correctly with negative Julian day numbers --- for instance, division
>> roundoffs might happen in the wrong direction. If somebody wanted to go
>> through and check/fix all that, we could probably relax the restriction.
> OK, challenge seems clear.
FWIW, I think this decision dates to a time when we still worried about
C89's lack of specificity about which direction integer division will
round negative results in. Now that we're targeting only C99-compliant
platforms, that part should be easier.
regards, tom lane
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