my $format = DateTime::Format::Strptime->new(
    pattern   => '%Y-%m-%d %H:%M:%S',
    time_zone => 'local',
);

my $min_start = DateTime->new( year => 2007, month => 5, day => 1, time_zone => 'local' );
my $max_stop  = DateTime->new( year => 2008, month => 5, day => 1, time_zone => 'local' );