find_all_by_date_range allows you to find ActiveRecord::Base models based on a date range. By default find_all_by_date_range uses the :created_at column of the model to search. This can be changed to something else by passing {:use => :column_name} as an option.
gem install find_all_by_date_range --source http://gems.github.com
Find all records by :created_at column (Default)
Invoice.find_all_by_date_range(1.year.ago,Time.now)
Find all records by a custom column name
Invoice.find_all_by_date_range(1.year.ago,Time.now,{:use => :invoiced_on})
Find all records with limit option
Invoice.find_all_by_date_range(1.year.ago,Time.now,{:limit => 5})