file-write-date

ToC

Allegro CL

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 implementation in implementation.html for information on the implementation of file-write-date.