Invalid gemspec because of the date format in specification

Question

When I include a gem that I made, thanks to Bundler (version 1.0.12), in a Gemfile and then I try to bundle or to rake just like that:

$ rake

I\

Answer 1

This is my environment:

RubyGems Environment:
- RUBYGEMS VERSION: 1.8.10
- RUBY VERSION: 1.9.2 (2011-07-09 patchlevel 290) [x86_64-darwin11.1.0]
- INSTALLATION DIRECTORY: /Users/user/.rvm/gems/ruby-1.9.2-p290@app
- RUBY EXECUTABLE: /Users/user/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
- EXECUTABLE DIRECTORY: /Users/user/.rvm/gems/ruby-1.9.2-p290@app/bin
- RUBYGEMS PLATFORMS:
  - ruby
  - x86_64-darwin-11
- GEM PATHS:
   - /Users/user/.rvm/gems/ruby-1.9.2-p290@app
   - /Users/user/.rvm/gems/ruby-1.9.2-p290@global
- GEM CONFIGURATION:
   - :update_sources => true
   - :verbose => true
   - :benchmark => false
   - :backtrace => false
   - :bulk_threshold => 1000
- REMOTE SOURCES:
   - http://rubygems.org/

I finally managed to find a cause / a way to prevent these errors on my system. I just revert to cucumber and cucumber-rails version 1.0.2. Using the latest versions was doing this...