use strict;
use warnings;

my $eval_time = get_time_of_thing_i_am_checking();
my $now = time();
my $some_interval = 60 * 60 * 14;
if (($now - $eval_time) > $some_interval) {
  # do stuff
}  
else {
  print "Not enough time has elapsed.  Go fish.\n";
}