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| ANSI Common Lisp 20 Files 20.2 Dictionary of Files
20.2.6 file-write-date | Function
  Syntax: file-write-date pathspec date Arguments and Values: pathspec - a pathname designator. date - a universal time or nil. Description: Returns a universal time representing the time at which the file specified by pathspec was last written (or created), or returns nil if such a time cannot be determined. Examples:
       (with-open-file (s "noel.text"
                          :direction :output :if-exists :error)
         (format s "~&Dear Santa,~2%I was good this year.  ~
                      Please leave lots of toys.~2%Love, Sue~
                   ~2%attachments: milk, cookies~%")
         (truename s))
       #P"CUPID:/susan/noel.text"
       (with-open-file (s "noel.text")
         (file-write-date s))
       2902600800
Affected By: The host computer's file system. Exceptional Situations: An error of type file-error is signaled if pathspec is wild. An error of type file-error is signaled if the file system cannot perform the requested operation. See Also: Section 25.1.4.2 Universal Time, Section 19.1.2 Pathnames as Filenames Allegro CL Implementation Details: See cl:file-write-date in implementation.htm for information on the implementation of file-write-date. Note the links are to the documentation for the current Allegro CL version. Replace /current/ in the URL with the Allegro CL version number to see similar documentation in earlier releases.

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