A rollup of various Capybara date/time step definition gists, updated for Capybara 0.4.1.2 and XPath 0.1.3

capybara_select_dates_and_times.rb

require "xpath" # XPath is a separate gem now

module Cucumber
  module Rails
    module CapybaraSelectDatesAndTimes
      def select_date (date, options = {})
        date = Date.parse(date)

        # lookup id prefix by label
        id_prefix = id_prefix_for(options[:label])

        # select the appropriate date values
        select(date.year.to_s, :from => "#{id_prefix}_1i")
        select(date.strftime('%B'), :from => "#{id_prefix}_2i")
        select(date.day.to_s, :from => "#{id_prefix}_3i")
      end

      def select_time (time, options = {})
        time = Time.parse(time)

        # lookup id prefix by label
        id_prefix = id_prefix_for(options[:label])

        # select the appropriate time values
        select(time.hour.to_s.rjust(2, '0'), :from => "#{id_prefix}_4i")
        select(time.min.to_s.rjust(2, '0'), :from => "#{id_prefix}_5i")
      end

      def select_datetime (datetime, options = {})
        select_date(datetime, options)
        select_time(datetime, options)
      end

      protected
      def id_prefix_for (label_text)
        # lookup label by contents
        # determine the datetime fields' id prefix from the label's @for attribute
        find(:xpath, %Q{//form/*/label[contains(text(), "#{label_text}")]})[:for]
      end
    end
  end
end

World(Cucumber::Rails::CapybaraSelectDatesAndTimes)

When /^(?:|I )select "([^\"]*)" as the "([^\"]*)" time$/ do |time, selector|
  select_time(time, :label => selector)
end

When /^(?:|I )select "([^\"]*)" as the "([^\"]*)" date$/ do |date, selector|
  select_date(date, :label => selector)
end

When /^(?:|I )select "([^\"]*)" as the "([^\"]*)" date and time$/ do |datetime, selector|
  select_datetime(datetime, :label => selector)
end