How many digits are printed with double precision?

Hello,

I'm using postgreSQL and python (PyGreSQL) and face a strange problem.

I have a double precision column in my DB (it's the time at which an image was taken expressed in second from UNIX epoch). When I query the value (SELECT time...) I get only 5 digits after the dot (while I suppose there are 6 digits). I have the same result when using pgadmin. The results looks like the rounding of the desired time (which I know by the filename).

Is it because postgreSQL only returns a fixed amount of digits or is the mistake is coming from my INSERTion (something like a semiconscious rounding).

Thanks in advance,
Mathieu