gistfile1.rb

Andrey-Mac-BookPro:saygo ka8725$ irb
irb(main):001:0> Date
NameError: uninitialized constant Date
	from (irb):1
irb(main):002:0> require 'date'
=> true
irb(main):003:0> Time.now - (Time.now - 10)
=> 9.999999
irb(main):004:0> (Time.now - (Time.now - 10)).class
=> Float
irb(main):005:0> DateTime.now - DateTime.parse("10.10.10")
=> Rational(7893814354908253, 10800000000)
irb(main):006:0> (DateTime.now - DateTime.parse("10.10.10")).class
=> Rational
irb(main):007:0>