FuzzyDate

 Routines to manage the FuzzyDate Class. There is also an extension to the
  ActiveRecord::Base class to provide an 'acts_as_fuzzy_date' class method.
 
  Historical dates are often incomplete or approximate and this class allows
  such dates to be worked with and stored on a database.

Available as a gem on RubyGems.org and can be installed with

gem install fuzzy_date 

demiCHEF

recipe management system for restaurants and catering