any way to convert date via libpq?

Hi Everybody,

I have a C program to read a postgres table.  One of
the columns of this table is defined as:

  timestamp without time zone

Is there any routine/function that I can use to convert
this field/column value into unix/linux style date for
comparison purpose?

Thank you.

Regards,

Tena Sakai
tsakai@gallo.ucsf.edu