I am trying to get Date::Manip to calculate the number of business hours between two dates. I am seeing some peculiar results that I can't find reference to in the business mode section of the docs. When I compare "today at 1PM" with "tomorrow at 10AM" in business mode, the result is 6 hours as I was expecting. However, when I compare "today at 1PM" with "tomorrow at 1PM" in business mode, the result is 24 hours, not 9 hours as I was expecting. I am certain that ParseDate is parsing the dates correctly. It is just that DateCalc is not returning results as I expect.
Here are my effective Date::Manip configuration options relating to business mode:
WorkWeekBeg=1
WorkWeekEnd=5
WorkDayBeg=08:00
WorkDayEnd=17:00
WorkDay24Hr=0
TomorrowFirst=1

[download]

Here is the code I am using for testing:
use Date::Manip;
use strict;

my $mode = 2; # 2 = business mode, 1 = normal mode

my $dateA = ParseDate("today at 1PM");
my $dateB = ParseDate("tomorrow at $ARGV[0]");
my $err;
my $difference = Delta_Format(DateCalc($dateA,$dateB,\$err,$mode),0,"%
+hh");

print "$difference hours.\n";

[download]

Running it this way: perl busihours.pl 10:00
prints out: 6 hours

while running this: perl busihours.pl 13:00
prints out: 24 hours.

Can anyone explain the behavior?

Dave

In reply to Date::Manip business calculations by davemabe

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