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Date.distance_to method for Ruby (See related posts)

Gives years, months, and days between two dates (like a human would expect)

class Date
  def distance_to(end_date)
    years = end_date.year - year
    months = end_date.month - month
    days = end_date.day - day
    if days < 0
      days += 30
      months -= 1
    end
    if months < 0
      months += 12
      years -= 1
    end
    {:years => years, :months => months, :days => days}
  end
end
to ruby date dates distance by timmorgan on Fri May 26 20:58:55 -0400 2006

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