Set up the time an entry should expire from the arp cache as a function of seconds returned from gettimeofday.
Uses gettimeofday to aid in the determination of our timezone.
Use gettimeofday to determine if a connection has timed out.
Uses it to timestamp the last time the connection was active.
This appears to only be a delta. Only the seconds field is used.
Used as a delta between the CLEAR and GET actions.