Bad date external representation

I keep getting this error:

> Warning: PostgreSQL query failed: ERROR: Bad date external
> representation 'Resource id #27' in
> /usr/local/apache/htdocs/asti/govph/functions/func_backup.php on line
> 16

Code:
> $query = "Select date_created from organizationinfo where ctrl_no =
> '$ctrl_no'";
> $date_created = pg_Exec($connectGovPH, $query);
>
> $query = "Select date_modified from organizationinfo where ctrl_no =
> '$ctrl_no'";
> $date_modified = pg_Exec($connectGovPH, $query);
>
> $query = "Insert into temp_organizationinfo
> VALUES('$ctrl_no','$organization_name','$domain_name','$loginID','$loginPassword','$date_created','$date_modified',4)";
> pg_Exec($connectGovPH, $query);

Here's the organizationinfo table:
> ctrl_no integer not null,
> organization_name varchar not null,
> domain_name varchar not null,
> login_id varchar not null,
> login_password varchar not null,
> date_created date,
> date_modified date,
> status int not null,
> constraint pk_organizationinfo_ctrl_no primary key(ctrl_no)

Date's are usually inputted as "2002-06-04", Can anyone help me find out
what causes this error, and how do I fix it?? =(

Regards,
Elijah A.