[R] problem in as.date

Terry Therneau therneau at mayo.edu
Fri May 1 17:02:04 CEST 2009

  Note that the 'date' class is no longer required by the survexp function, so 
the date library is no longer bundled into the survival package.
  You can still load the date package separately, but I discourage it since the 
newer Date class has more functionality and support.
  	Terry Therneau

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