1  module ActiveSupport #:nodoc:
   2    module CoreExtensions #:nodoc:
   3      module Integer #:nodoc:
   4        # Enables the use of time calculations and declarations, like 45.minutes + 2.hours + 4.years.
   5        #
   6        # These methods use Time#advance for precise date calculations when using from_now, ago, etc. 
   7        # as well as adding or subtracting their results from a Time object. For example:
   8        #
   9        #   # equivalent to Time.now.advance(:months => 1)
  10        #   1.month.from_now
  11        #
  12        #   # equivalent to Time.now.advance(:years => 2)
  13        #   2.years.from_now
  14        #
  15        #   # equivalent to Time.now.advance(:months => 4, :years => 5)
  16        #   (4.months + 5.years).from_now
  17        # 
  18        # While these methods provide precise calculation when used as in the examples above, care
  19        # should be taken to note that this is not true if the result of `months', `years', etc is
  20        # converted before use:
  21        #
  22        #   # equivalent to 30.days.to_i.from_now
  23        #   1.month.to_i.from_now
  24        #
  25        #   # equivalent to 365.25.days.to_f.from_now
  26        #   1.year.to_f.from_now
  27        #
  28        # In such cases, Ruby's core
  29        # Date[http://stdlib.rubyonrails.org/libdoc/date/rdoc/index.html] and
  30        # Time[http://stdlib.rubyonrails.org/libdoc/time/rdoc/index.html] should be used for precision
  31        # date and time arithmetic
  32        module Time        
  33          def months
  34            ActiveSupport::Duration.new(self * 30.days, [[:months, self]])
  35          end
  36          alias :month :months
  37 
  38          def years
  39            ActiveSupport::Duration.new(self * 365.25.days, [[:years, self]])
  40          end
  41          alias :year :years
  42        end
  43      end
  44    end
  45  end