How to calculate how many years passed since a given date in Ruby?

Question

This question was here for other languages, so let here be one for Ruby.

How do I calculate number of complete years that have passed from a given date? As you prob

Answer 1

How about this:

def age_in_years(date)
  # Difference in years, less one if you have not had a birthday this year.
  today = Date.today
  age = today.year - date.year
  age = age - 1 if [date.day, date.month, today.year].join('/').to_date > Date.today
end