class Numeric

def seconds

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

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

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

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

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