timestamp conversion to unisgned long? - Mailing list pgsql-sql

All,
  Perhaps I'm not sing hte correct datatype, but I'd like to be able to convert
a timestamp over to an unsigned long to be used within C code and compare
to the output of time().

 I can't seem to see any easy way of doing this using the built in
stuff for postgresql.

  Ideas?

  Perhaps I'm using the wrong type?

 Pierre