distance_of_time_in_words

gistfile1.txt

irb(main):062:0> puts time_start.class
ActiveSupport::TimeWithZone
=> nil
irb(main):063:0> distance_of_time_in_words(time_start, Time.now)
NoMethodError: undefined method `distance_of_time_in_words' for main:Object
	from (irb):63
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/commands/console.rb:44:in `start'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/commands/console.rb:8:in `start'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/commands.rb:23:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'