Time::Piece is a core module.
#!/perl
use strict;
use warnings;
use Time::Piece;
my $datt = Time::Piece->strptime("2012-03-22", "%Y-%m-%d");
my $datf = Time::Piece->strptime("1925-12-22", "%Y-%m-%d");
my $diff = $datt - $datf;
my $result = $diff->years;
print "$result years\n";
$result = $diff->days;
print "$result days\n";
prints:
C:\Perl\bin>perl pm_1033486.pl
86.2496055700018 years
31502 days
See also Time::Seconds for the data values transformation.
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