gistfile1.rb

class MeetingDates
  def initialize
    @crb_dates = []
    @jam_dates = []
    calc_meeting_dates
  end

  def calc_meeting_dates
    start_date = Date.today.beginning_of_year
    (0..12).inject([]){|s, num| dates_for_month(start_date + num.months)}
  end

  def dates_for_month(relative_date)
    s = relative_date.beginning_of_month
    e = relative_date.end_of_month
    crb_date = (s..e).select{|d| d.wday == 1}[2] + 18.5.hours
    @crb_dates << crb_date
    @jam_dates << crb_date + 9.days
  end

  def next_crb_meeting
    @crb_dates.find{|d| d > Time.now}
  end

  def next_jam_meeting
    @jam_dates.find{|d| d > Time.now}
  end
end