Re: Epoch from age is incorrect

On Mon, Oct 11, 2021 at 02:52:59PM -0700, David G. Johnston wrote:
> On Monday, October 11, 2021, Zhihong Zhang <zhihong(at)gmail(dot)com> wrote:
>
>
> They are several days apart. Maybe leap years are not counted properly?
>
>
> That is related.  Intervals supply integer years, months, and days (for
> example).  Given an integer month (or year) value there is no way to accurately
> compute the number of days involved (or any subfield of day) since you lack
> knowledge of which months (years) they are (generally).  So extracting an epoch
> from an interval is an inherently unwise thing to do.  Having done it,
> comparing its result to a timestamp epoch computation is meaningless.  If you
> can do the later then just do it as it will provide the expected answer while
> the interval epoch is inherently problematic.

Yes. Also, this blog has more details:

https://momjian.us/main/blogs/pgblog/2020.html#August_3_2020

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.