Jerome Wagner <jerome.wagner@laposte.net> writes:
> seeing you answer I have a question for which I found no answer a few weeks
> ago : is there a way to know at runtime which internal representation
> timestamps have ?
You can inspect the integer_datetimes setting, via SHOW or
current_setting(). In a libpq client it's also directly available
from PQparameterStatus().
regards, tom lane