Verify Dates in Rails (See related posts)

From http://www.railtie.net/articles/2006/09/07/validate-dates-in-your-models:
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The thing I find really nice is that if you pass it a malformed date, it returns nil. This means, in your model validations, you can add:

require 'chronic'

class Meeting < ActiveRecord::Base

  def validation
    errors.add :meeting_date, 'is not a valid date' if Chronic.parse(meeting_date.to_s).nil?
  end

end

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Other Chronic examples:
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mojombo in #caboose, just released his first version of Chronic, a new Ruby Gem for natural language processing of Dates and Times.

gem install chronic

irb:>
Chronic.parse('tomorrow')
    #=> Mon Aug 28 12:00:00 PDT 2006

Chronic.parse('monday', :context => :past)
    #=> Mon Aug 21 12:00:00 PDT 2006

Chronic.parse('this tuesday 5:00')
    #=> Tue Aug 29 17:00:00 PDT 2006

Chronic.parse('this tuesday 5:00', :ambiguous_time_range => :none)
    #=> Tue Aug 29 05:00:00 PDT 2006

Chronic.parse('may 27th', :now => Time.local(2000, 1, 1))
    #=> Sat May 27 12:00:00 PDT 2000

Chronic.parse('may 27th', :guess => false)
    #=> Sun May 27 00:00:00 PDT 2007..Mon May 28 00:00:00 PDT 2007

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