XPsetDate()
  Set the system date
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   Function:   XPsetDate()

               Using XPsetDate() one can set the current date of
               the operating system. This date will then be the
               default used everywhere (eg. date stamping of
               files etc..).

   Syntax:     XPsetDate(<dVar>)

   Arguments:  <dVar> is a date variable, containing the date you
               wish to set.

   Returns:    Logical var, .t. if date set was succesfull, .f.
               if date was invalid.

   Usage:      * advance date one day, don't check..
               XPsetDate( ( Date() + 1) )