@param Date.years_between_dates(Date.new(2015,11,1),Date.new(2012,11,15))
=> 3
@param Time.years_between_dates(Time.new(2015,11,1),Time.new(2012,11,15))
Time.new
@return [Fixnum]
# File lib/modules/year.rb, line 17 def years_between_dates(date1, date2) (date1.year - date2.year).abs end