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require 'active_support/duration'
require 'active_support/core_ext/time/calculations'
require 'active_support/core_ext/time/acts_like'

class Numeric
  # Enables the use of time calculations and declarations, like 45.minutes + 2.hours + 4.years.
  #
  # These methods use Time#advance for precise date calculations when using from_now, ago, etc.
  # as well as adding or subtracting their results from a Time object. For example:
  #
  # # equivalent to Time.now.advance(:months => 1)
  # 1.month.from_now
  #
  # # equivalent to Time.now.advance(:years => 2)
  # 2.years.from_now
  #
  # # equivalent to Time.now.advance(:months => 4, :years => 5)
  # (4.months + 5.years).from_now
  #
  # While these methods provide precise calculation when used as in the examples above, care
  # should be taken to note that this is not true if the result of `months', `years', etc is
  # converted before use:
  #
  # # equivalent to 30.days.to_i.from_now
  # 1.month.to_i.from_now
  #
  # # equivalent to 365.25.days.to_f.from_now
  # 1.year.to_f.from_now
  #
  # In such cases, Ruby's core
  # Date[http://stdlib.rubyonrails.org/libdoc/date/rdoc/index.html] and
  # Time[http://stdlib.rubyonrails.org/libdoc/time/rdoc/index.html] should be used for precision
  # date and time arithmetic
  def seconds
    ActiveSupport::Duration.new(self, [[:seconds, self]])
  end
  alias :second :seconds

  def minutes
    ActiveSupport::Duration.new(self * 60, [[:seconds, self * 60]])
  end
  alias :minute :minutes

  def hours
    ActiveSupport::Duration.new(self * 3600, [[:seconds, self * 3600]])
  end
  alias :hour :hours

  def days
    ActiveSupport::Duration.new(self * 24.hours, [[:days, self]])
  end
  alias :day :days

  def weeks
    ActiveSupport::Duration.new(self * 7.days, [[:days, self * 7]])
  end
  alias :week :weeks

  def fortnights
    ActiveSupport::Duration.new(self * 2.weeks, [[:days, self * 14]])
  end
  alias :fortnight :fortnights

  # Reads best without arguments: 10.minutes.ago
  def ago(time = ::Time.current)
    time - self
  end

  # Reads best with argument: 10.minutes.until(time)
  alias :until :ago

  # Reads best with argument: 10.minutes.since(time)
  def since(time = ::Time.current)
    time + self
  end

  # Reads best without arguments: 10.minutes.from_now
  alias :from_now :since
end
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