my %ny_holidays = ();
...
$ny_holidays{'20090101'} = 'New Years Day';
$ny_holidays{'20090115'} = 'MLK';
$ny_holidays{'20090219'} = 'Presidents day';
$ny_holidays{'20090406'} = 'Good Friday';
$ny_holidays{'20090528'} = 'Memorial Day';
$ny_holidays{'20090704'} = 'Independence Day';
$ny_holidays{'20090903'} = 'Labor day';
$ny_holidays{'20091122'} = 'Thanksgiving';
$ny_holidays{'20091225'} = 'Christmas Day';