Unit Test Bug

- Fixed an odd bug in the unit tests.  If today is the 14th of the month,
  then subtracting 14 * 86_400 from the current time results in a date that
  is in the prior month.  Except of course, for one month following the shift
  from summer time to standard time, when the test is run between 11:00pm and
  midnight.  The reverse happens in the spring.

test/history.monthly.t

@@ -43,7 +43,7 @@ if (open my $fh, '>', 'time.rc')
 
 my @timeArray = localtime(time);
 my $now     = time ();
-my $lastmonth   =  $now - $timeArray[3] * 86_400;
+my $lastmonth   =  $now - ($timeArray[3] + 1) * 86_400;
 
 if (open my $fh, '>', 'pending.data')
 {