temporal_cucumber_helpers.rb

require 'timecop'

module TemporalHelpers
  
  # Travels to +time+ and lets the clock keep running.
  # 
  # If a block is given, executes the block at that
  # time then returns to the present.
  def travel_to(time, &block)
    Timecop.travel Time.parse(time), &block
  end
  
  # Travels to and freezes the clock at +time+.
  # 
  # If a block is given, executes the block at that
  # time then returns to the present.
  def freeze_time_at(time, &block)
    Timecop.freeze Time.parse(time), &block
  end
   
end

World(TemporalHelpers)

Given /^it is currently (.+)$/ do |time|
  travel_to time
end

Given /^time is frozen at (.+)$/ do |time|
  freeze_time_at time
end

Given /^(?:I|we) jump in our Delorean and return to the present$/ do
  Timecop.return
end

After do
  Timecop.return
end