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I need to determine what has changed in the file system.

How can I a get the time when a file was last modified?

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The modification time of a file will always be returned by file-or-directory-modify-seconds. This will also return the modification date of directories except from the FAT format file systems - for directories a FAT file system will return the creation date instead.

To convert the file modification time, or any time in seconds to a more readable format you can use seconds->date.

> (require racket/date) ;for date->string only > (date->string (seconds->date (file-or-directory-modify-seconds (string->path "/home/ben/.emacs")))) "Wednesday, June 4th, 2014"

reference: racket discussion list

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