Uh, what's the problem with Date::Calc's Delta_Days()?
use Date::Calc qw/ Delta_Days /;
my $date1 = "01/12/2003";
my $date2 = "01/01/2004";
my( $d1, $m1, $y1 ) = split( /\//, $date1 );
my( $d2, $m2, $y2 ) = split( /\//, $date2 );
my $dd = Delta_Days( $y1, $m1, $d1, $y2, $m2, $d2 );
print "diff is $dd days\n";
(note: I noticed you had dd/mm/yy, but I got lazy ;)
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