[Wlug] Is there a simple Unix shell command to list dates backwards?

I'm looking for a standard Unix shell command that can list an arbitrary number of day dates backwards from today. For example, something like this: $ unixcommand -7 Tuesday July 5 2005 Monday July 4 2005 Sunday July 3 2005 Saturday July 2 2005 Friday July 1 2005 Thursday June 30 2005 Wednesday June 29 2005 Command must transit months, years, leap-years, etc. Does gcal, or any other Unix command, have this capability? Thanks, Doug