I just had to solve this exact problem and Date::Business worked perfectly. See my test script below: 
use strict;
use warnings;

use Business::Hours;
use Time::Local;

my $timeout_period_hours = 12;

my @tests                = (

                             { start_date => "2006-06-05 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 00:59:59",   
+        # Monday
                               comment    => "1 hour - in a business d
+ay" },

                             { start_date => "2006-06-05 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 08:59:59",   
+        # Monday
                               comment    => "9 hours - in a business 
+day" },

                             { start_date => "2006-06-05 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 11:59:59",   
+        # Monday
                               comment    => "12 hours - in a business
+ day" },

                             { start_date => "2006-06-05 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 12:59:59",   
+        # Monday
                               comment    => "13 hours - in a business
+ day" },

                             { start_date => "2006-06-05 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 23:59:59",   
+        # Monday
                               comment    => "1 day - 1 business day" 
+},

                             { start_date => "2006-06-04 00:00:00",   
+     # Sun
                               end_date   => "2006-06-05 23:59:59",   
+        # Monday
                               comment    => "2 days - 1 business day"
+ },

                             { start_date => "2006-06-03 00:00:00",   
+     # Sat
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "3 days - 1 business day"
+ },

                             { start_date => "2006-06-02 00:00:00",   
+     # Friday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "4 days - 2 business days
+" },

                             { start_date => "2006-06-01 00:00:00",   
+     # Thurs
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "5 days - 3 business days
+" },

                             { start_date => "2006-05-31 00:00:00",   
+     # Wed
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "6 days - 4 business days
+" },

                             { start_date => "2006-05-30 00:00:00",   
+     # Tuesday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "7 days - 5 business days
+" },

                             { start_date => "2006-05-29 00:00:00",   
+     # Monday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "8 days - 6 business days
+" },

                             { start_date => "2006-05-28 00:00:00",   
+     # Sunday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "9 days - 6 business days
+" },

                             { start_date => "2006-05-27 00:00:00",   
+     # Saturday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "10 days - 6 business day
+s" },

                             { start_date => "2006-05-26 00:00:00",   
+     # Friday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "11 days - 7 business day
+s" },

                             { start_date => "2006-05-25 00:00:00",   
+     # Thursday
                               end_date   => "2006-06-05 23:59:59",   
+     # Monday
                               comment    => "12 days - 8 business day
+s" },

                             { start_date => "2006-06-03 00:00:00",   
+     # Saturday
                               end_date   => "2006-06-04 23:59:59",   
+        # Sunday
                               comment    => "2 non-business days" },

                             { start_date => "2006-06-04 00:00:00",   
+     # Sunday
                               end_date   => "2006-06-05 01:59:59",   
+        # Monday
                               comment    => "2 hours - 2 non-business
+ and 1 business days" },

                             { start_date => "2006-06-03 00:00:00",   
+     # Saturday
                               end_date   => "2006-06-05 01:59:59",   
+        # Monday
                               comment    => "2 hours - 2 non-business
+ and 1 business days" },

                             # THESE ARE LARGE TIME SPAN TESTS
                             { start_date => "2006-01-03 00:00:00",   
+     # Tuesday
                               end_date   => "2006-06-05 01:59:59",   
+        # Monday
                               comment    => "? hours - 2 non-business
+ and 1 business days" },

                             { start_date => "2005-01-03 00:00:00",   
+     # Tuesday
                               end_date   => "2006-06-05 01:59:59",   
+        # Monday
                               comment    => "? hours - 2 non-business
+ and 1 business days" },

                           );


my $bus_hours            = Business::Hours->new();    

$bus_hours->business_hours( 
                            0 => { Name => 'Sunday',    Start => undef
+,   End => undef},
                            1 => { Name => 'Monday',    Start => '00:0
+0', End => '23:59'},
                            2 => { Name => 'Tuesday',   Start => '00:0
+0', End => '23:59'},
                            3 => { Name => 'Wednesday', Start => '00:0
+0', End => '23:59'},
                            4 => { Name => 'Thursday',  Start => '00:0
+0', End => '23:59'},
                            5 => { Name => 'Friday',    Start => '00:0
+0', End => '23:59'},
                            6 => { Name => 'Saturday',  Start => undef
+,   End => undef}
                          );

my $test_counter         = 0;

foreach (@tests) {

   my $test              = $_;

   $test_counter++;

   my $comment           = $test->{comment} || '';

   my $end_date          = $test->{end_date};
   my @end_date          = split(/\D/, $end_date);
   my $end_time          = timelocal($end_date[5], $end_date[4], $end_
+date[3], $end_date[2], ($end_date[1] - 1), $end_date[0]);

   my $start_date        = $test->{start_date};
   my @start_date        = split(/\D/, $start_date);
   my $start_time        = timelocal($start_date[5], $start_date[4], $
+start_date[3], $start_date[2], ($start_date[1] - 1), $start_date[0]);

   my $result            = $bus_hours->for_timespan(Start => $start_ti
+me, End => $end_time);

   #my $elements         = $result->elements();
   #my $elements_count   = $result->cardinality();
   #my $seconds          = scalar(@$elements);

   my $seconds           = $result->cardinality();
   my $hours             = ($seconds / 60 / 60);
   my $days              = ($hours / 24);

   #$hours               = sprintf("%d", $hours);
   #$days                = sprintf("%d", $days);

   #print "TEST[$test_counter]: [$start_date][$end_date]\n[$comment]\n
+DIFFERENCE SECONDS/HOURS: [$seconds][$hours]\n\n";
   print "TEST[$test_counter]: [$comment]\nDATES: [$start_date] TO [$e
+nd_date]\nBUSINESS SECONDS/HOURS/DAYS: [$seconds][$hours][$days]\n\n"
+;

}

print "Done\n";

[download]

In reply to Re^2: determining work hours between 2 dates by tokpela
in thread determining work hours between 2 dates by kosie99

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