Have we dealt with this?
> With 6.4 or current sources, I find that coercing a datetime to float8
> is a no-op:
>
> treetest=> create table dt1 (t datetime);
> CREATE
> treetest=> insert into dt1 values('now');
> INSERT 159593 1
> treetest=> select t from dt1;
> t
> ----------------------------
> Sun Jan 24 18:28:50 1999 EST
> (1 row)
>
> treetest=> select t::float8 from dt1;
> ?column?
> ----------------------------
> Sun Jan 24 18:28:50 1999 EST
> (1 row)
>
>
> I was expecting to get either some numerical equivalent to the date
> (seconds since 1970 would do nicely, but I'll take the internal rep...)
> or an error message saying "no such conversion available". I was
> certainly not expecting to find that the result was still a datetime,
> but such it appears to be. This is a bug, wouldn't you say?
>
> What's even more curious is that coercing to int4 does produce
> something numeric:
>
> treetest=> select t::int4 from dt1;
> int4
> ---------
> -29464270
> (1 row)
>
>
> regards, tom lane
>
>
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