gistfile1.rb

# gem install sinatra sinatra-contrib icalendar

require 'sinatra'
require "sinatra/reloader" if development?
require 'icalendar'
require 'date'

get '/schedule.ics' do

  cal = Icalendar::Calendar.new

  # Set up timezone
  cal.timezone do
    timezone_id             "America/Chicago"

    daylight do
      timezone_offset_from  "-0600"
      timezone_offset_to    "-0500"
      timezone_name         "CDT"
      dtstart               "19700308T020000"
      add_recurrence_rule   "FREQ=YEARLY;BYMONTH=3;BYDAY=2SU"
    end

    standard do
      timezone_offset_from  "-0500"
      timezone_offset_to    "-0600"
      timezone_name         "CST"
      dtstart               "19701101T020000"
      add_recurrence_rule   "FREQ=YEARLY;BYMONTH=11;BYDAY=1SU"
    end
  end

  # Build a bunch of test events
  (10..14).each do |hour|
    %w(First Second).each do |name|
      cal.event do
        summary     "#{name} Session at #{hour} with a pretty long title that will likely wrap."
        dtstart     DateTime.parse("4th Apr 2012 #{hour}:00:00")
        dtend       DateTime.parse("4th Apr 2012 #{hour + 1}:00:00")
        location    "Minnetonka"
        organizer   "", :CN => "Luke Francl\\, Ben Edwards\\, Adrienne Peirce"
        categories  ["Design"]
        description "Raising investment capital - whether seed, angel, or venture - can be a necessary ingredient of the startup lifecycle."
      end
    end
  end

  # Return the feed
  cal.to_ical

end