Date repeat options, "Next to last, Third from last, etc." always return as "last"

This is my first time submitting a support request so please bear with me if some things do not make sense.

In date_api.module (line 2140) the helper function date_order() translates positive and negative numbers to the English text representations for the order.

function date_order() {
  return array(
    '+1' => 'First',
    '+2' => 'Second',
    '+3' => 'Third',
    '+4' => 'Fourth',
    '+5' => 'Fifth',
    '-1' => 'Last',
    '-2' => 'Next to last',
    '-3' => 'Third from last',
    '-4' => 'Fourth from last',
    '-5' => 'Fifth from last'
  );
}

The English representations are used in date_modify() functions in date_repeat_calc.inc. All representations from +1 through -1 work fine in the date_modify() function but -2 though -5 all seem to give incorrect values.

For example, each of the following lines:

date_modify($date, Next to last Tuesday);
date_modify($date, Third from last Tuesday);
date_modify($date, Fourth from last Tuesday);
date_modify($date, Fifth from last Tuesday);

Seem to always be translated to:

date_modify($date, last Tuesday);

It doesn't seem like the keywords before the word "last" are being respected. If date_order() were changed to the following the repeat options for -2 through -5 seem to work fine.

function date_order() {
  return array(
    '+1' => 'First',
    '+2' => 'Second',
    '+3' => 'Third',
    '+4' => 'Fourth',
    '+5' => 'Fifth',
    '-1' => 'Last',
    '-2' => '-2',
    '-3' => '-3',
    '-4' => '-4',
    '-5' => '-5'
  );
}

Is there any other way to fix the repeats for -2 through -5?