libpq binary data

Hello,
I try to get the epoch value of a date via the 
PQexecParams(conn, "SELECT extract(epoch from date + time) as epoch, content 
FROM daten .....);
In that database, the timestamp ist stored in the two fields date and time.
I want to get this data in binary form. The 
PQfsize(res, 1); 
tells me, that the size of the returned data is 8 byte (in contrast to the 
standard size of epoch, which is meant to be 4 byte)
I don't manage to get the epoch valule (seconds since 1970) from that returned 
value. After ntohll (which I wrote as a wrapper around ntohl for long int, see 
below) it is a very huge value (4743709917079142400) but it should be 
1412179252 as I get it from the psql interface, when I type in the same 
command.
What am I missing or doing wrong?
Thanks for any help in advance

Thilo

unsigned long int ntohll(long int x)
{if (ntohl(1) == 1)    return x;else    return (long int) (ntohl((int)((x << 32) >> 32))) << 32 | (long 
int)ntohl(((int)(x >> 32)));
}