file-write-date - ANSI Common Lisp

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file-write-date (Function)

Syntax:

— Function: 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.