#!/usr/bin/perl
use strict;
use warnings;

use DateTime::Format::Strptime;
use Datetime::Set;

my $strp = DateTime::Format::Strptime->new( pattern => '%Y-%m-%d %T', );

my $datf = qq{2012-01-01 04:00:00};
my $datt = qq{2012-01-02 23:00:00};

my $start = $strp->parse_datetime($datf);
my $end = $strp->parse_datetime($datt);

my $iter;

my $set = DateTime::Set->from_recurrence(
        after => $start,
        before => $end,
        recurrence => sub {
        return $_[0]->add( hours => 1 )->truncate( to => 'hour' )
        },
    );

my $datf_plus = $start->add( hours => 10 );

my $set_2 = DateTime::Set->from_datetimes( dates => [ $datf_plus ] );

if ( $set->contains( $set_2 ) ) # or intersects
{
	print "\nYes!\n";
	print $set->contains( $set_2 ), "\n";
}
else
{
	print "\nNo!\n";
	print $set->contains( $set_2 ), "\n";
}