How can I calculate the number of days between two dates in Perl?

Question

I want to calculate (using the default Perl installation only) the number of days between two dates. The format of both the dates are like so 04-MAY-09. (DD-MMM-YY)

I

Answer 1

Time::ParseDate will handle that format just fine:

use Time::ParseDate qw(parsedate);

$d1="04-MAR-09";
$d2="06-MAR-09";

printf "%d days difference\n", (parsedate($d2) - parsedate($d1)) / (60 * 60 * 24);