Re: SELECT timestamp('2001-06-12'::date - '2000-06-12'::date)

Hans-Jürgen Schönig <hs@cybertec.at> writes:
> Surprisingly "-" is defined for (date, date).

What's surprising about that?  It yields an integer number of days
between the dates:

regression=# select '2001-06-12'::date - '2000-06-12'::date;?column?
----------     365
(1 row)

> performance=# SELECT timestamp('2001-06-12'::date - '2000-06-12'::date);

>        timestamp
> ------------------------
>  1970-01-01 01:06:05+01
> (1 row)

timestamp(integer) converts a Unix timestamp value (seconds since 1970)
into a timestamp.
        regards, tom lane