BikeBikeBike/app/models/event.rb

class Event < ActiveRecord::Base
  translates :info, :title

  belongs_to :conference
  belongs_to :event_location

  def conference_day
    return nil unless start_time.present? && end_time.present?

    start_day = conference.start_date.change(hour: 0, minute: 0, second: 0)
    w_start_day = start_time.change(hour: 0, minute: 0, second: 0)
    return (((w_start_day - start_day) / 86400) + 1).to_i
  end

  def duration
    return nil unless start_time.present? && end_time.present?
    ((end_time - start_time) / 60).to_i
  end

end