class Integer

def months

date and time arithmetic.
Time[http://ruby-doc.org/stdlib/libdoc/time/rdoc/Time.html] should be used for precision
Date[http://ruby-doc.org/stdlib/libdoc/date/rdoc/Date.html] and
In such cases, Ruby's core

1.year.to_f.from_now
# equivalent to 365.25.days.to_f.from_now

1.month.to_i.from_now
# equivalent to 30.days.to_i.from_now

+months+, +years+, etc is converted before use:
above, care should be taken to note that this is not true if the result of
While these methods provide precise calculation when used as in the examples

(4.months + 5.years).from_now
# equivalent to Time.now.advance(months: 4, years: 5)

2.years.from_now
# equivalent to Time.now.advance(years: 2)

1.month.from_now
# equivalent to Time.now.advance(months: 1)

results from a Time object.
from_now, +ago+, etc. as well as adding or subtracting their
These methods use Time#advance for precise date calculations when using

2.hours + 4.years.
Enables the use of time calculations and declarations, like 45.minutes + 
def months
  ActiveSupport::Duration.new(self * 30.days, [[:months, self]])
end

def multiple_of?(number)

10.multiple_of?(2) # => true
6.multiple_of?(5) # => false
0.multiple_of?(0) # => true

Check whether the integer is evenly divisible by the argument. 
def multiple_of?(number)
  number != 0 ? self % number == 0 : zero?
end

def ordinal

-1001.ordinal # => "st"
-11.ordinal # => "th"
1003.ordinal # => "rd"
1002.ordinal # => "nd"
2.ordinal # => "nd"
1.ordinal # => "st"

in an ordered sequence such as 1st, 2nd, 3rd, 4th.
Ordinal returns the suffix used to denote the position 
def ordinal
  ActiveSupport::Inflector.ordinal(self)
end

def ordinalize

-1001.ordinalize # => "-1001st"
-11.ordinalize # => "-11th"
1003.ordinalize # => "1003rd"
1002.ordinalize # => "1002nd"
2.ordinalize # => "2nd"
1.ordinalize # => "1st"

position in an ordered sequence such as 1st, 2nd, 3rd, 4th.
Ordinalize turns a number into an ordinal string used to denote the 
def ordinalize
  ActiveSupport::Inflector.ordinalize(self)
end

def years 

def years
  ActiveSupport::Duration.new(self * 365.25.days, [[:years, self]])
end