example.rb

def times_for_period(date)
  regular_hours_by_week = Hash.new(0)
  
  regular_hours = 0
  other_hours = Hash.new(0)
  
  work_days_for_period(date).each do |d|
    times = d.times

    regular_hours += times[:regular_hours]

    regular_hours_by_week[d.date.cweek] += times[:regular_hours]

    times[:other_hours].each { |k,v| other_hours[k] += v }
  end

  weekly_hours = regular_hours_by_week.keys.sort.map do |k| 
    regular_hours_by_week[k]
  end

  {
    :regular_hours => regular_hours,
    :other_hours => other_hours,
    :weekly_hours => weekly_hours
  }
end