Re: adding times togeather

On Mon, Apr 28, 2003 at 02:25:54PM -0800, Steve Crawford wrote:

> You can:
> Subtract two times and get an interval
> Add an interval to a time to get a time

Beware:  you cannot (in 7.2.3 at least -- I don't have 7.3 available for
testing) add a timestamp to an interval and expect a reasonable value.
You have to add the interval to the timestamp.

h=> select '05:04:03'::interval + '2003-mar-01 09:05:00'::timestamp;
      ?column?
---------------------
 2003-03-01 05:04:03
(1 row)

h=> select '2003-mar-01 09:05:00'::timestamp + '05:04:03'::interval;
        ?column?
------------------------
 2003-03-01 14:09:03-03
(1 row)

h=> select version();
                                                 version
---------------------------------------------------------------------------------------------------------
 PostgreSQL 7.2.3 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
(1 row)