[R] Age of an object?

[Trevor Hastie]

It would be nice to have a date stamp on an object.
In S/Splus this was always available, because objects were files.

I have looked around, but I presume this information is not available.

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  Trevor Hastie                                  hastie at stanford.edu
  Professor, Department of Statistics, Stanford University
  Phone: (650) 725-2231 (Statistics)	         Fax: (650) 725-8977
	 (650) 498-5233 (Biostatistics)		 Fax: (650) 725-6951
  URL: http://www-stat.stanford.edu/~hastie
  address: room 104, Department of Statistics, Sequoia Hall
	          390 Serra Mall, Stanford University, CA 94305-4065