Use this for your ActiveRecord models that are time bound with a start and stop time.



Add this line to your application's Gemfile:

gem 'lifetime'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lifetime


Include lifetime to you model:

#use the default lifetime fields: start_at, end_at
class License < ActiveRecord::Base
  include Lifetime

#use the custom lifetime fields
class License < ActiveRecord::Base
  include Lifetime
  lifetime_fields :start_date, :end_date

License.lifetime #returns lifetime of the license
License.first.lifetime_expired? #returns true if the license is expired

Check specs for more usage


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the MIT License.