Question

I have an array with n strings in format of YYYY-MM-DD (Example, “2010-10-31”).

How do I compare a date to the strings in this array?

For example, delete the strings more than 30 day ago?

Answer 1

use strict; use warnings;
use DateTime ();
use DateTime::Duration ();
use DateTime::Format::Natural ();

my $parser = DateTime::Format::Natural->new;
my $now    = DateTime->now;
my $delta  = DateTime::Duration->new( days => 30 );
my $cutoff = $now->subtract_duration( $delta );

my @new_dates = map  { $_->[1] }
                grep { -1 == $_->[0] }
                map  { 
                    chomp;
                    [
                        DateTime->compare(
                            $parser->parse_datetime( $_ ),
                            $cutoff
                        ),
                        $_ 
                    ]
                } <DATA>;

print "@new_dates";

__DATA__
2010-07-31
2010-08-31
2010-09-30
2010-10-31