Items have date fields associated with them, which can be found in the columns on the Items page of containers.

• Authored Date: Defaults to the date the revision was uploaded.
  Note: You can change this date by right-clicking on the item and going to Advanced Options.
• Date Modified: Displays the last date that an item was edited or revised.
• Revision Date Created: Displays the date that the latest document revision was created.
• Revision Date Modified: Displays the date that this revision was changed.