What I want is just the date information "1st day of November 2005"

If you just wanted the date string, why not just:

$_ = "Accepted and agreed to by Jerry Smith
    as
of
          the 1st
   day of
         November
                 2005.";
print $1 if /(\d+(?:st|nd|rd|th)\s+day\s+of\s+[ADFJMNOSabceghilmnoprst
+uvy]+\s+\d+)/ms;
__END__
1st
   day of
         November
                 2005
[download]

which would also match "35th day of ANNO 0007", but the matched date strings need to be validated anyways...

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}