DocumentationMathematicaThe Mathematica BookMathematica Reference GuideDeveloper Context Objects in Mathematica 5
NotebookInformation[obj] gives information about the notebook represented by the specified notebook object.
NotebookInformation gives a list of rules which include information on times when data associated with the notebook was most recently modified.
ToDate can be used to convert these times to dates.
See also: AbsoluteOptions, FileInformation.