Provides routines that take the time and return the
number of seconds elapsed between January 1, 1970 and the specified time.
The arguments are defined like the corresponding arguments returned by
Perl's
gmtime
and
localtime
functions and the results agree
with the results of those functions. Exports two functions; both
return -1 if the integer limit is hit. On most
machines this applies to dates after January 1, 2038.