date --date='2001-10-01 last friday' etc

[Michael Wang]

(1)
>From "info date"
 
     A few numbers may be written out in words in most contexts.  This is
  most useful for specifying day of the week items or relative items (see
  below).  Here is the list: `first' for 1, `next' for 2, `third' for 3,
  `fourth' for 4, `fifth' for 5, `sixth' for 6, `seventh' for 7, `eighth'
  for 8, `ninth' for 9, `tenth' for 10, `eleventh' for 11 and `twelfth'
  for 12.  Also, `last' means exactly -1.
                 ************************

$ date --date='last Friday'   
Fri Oct  5 00:00:00 EDT 2001

$ date --date='-1 friday'   
date: invalid date `-1 friday'

So it looks like the documentation does not match the behavior.
Besides "last", there is no way to move day of week backward.
Please make an enhancement.

(2)
"1 day ago" can be applied to an alternative date, example:
$ date --date='2001-10-01 -1 day'

There is no way that I can find to do
$ date --date='2001-10-01 last Friday'

If there is, please let me know. Otherwise please make an enhancement.

Thanks.