How can DateTime be too hard to figure out? Come on! 
use DateTime;

my $date = DateTime->new( month => 2,
                          day   => 4,
                          year  => 2008 );

print "Start Date:       " . $date->mdy . "\n";

$date->subtract( days => 1);
print "Yesterday's Date: " . $date->mdy . "\n";

while( $date->day_of_week > 5) {
  $date->subtract( days => 1);
}
print "Next weekday date is " . $date->mdy() . "\n";

[download]

See! Easy as pie, a cow pie even! :)

In reply to Re^2: Yesterday Date by Herkum
in thread Yesterday Date by Anonymous Monk

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