build_times.rb

i = 0
j = 24 * 30
first_hour = 4
end_hour = 5
h = {}
while(i < j) do
  start_time = Time.current.beginning_of_hour + first_hour.hours
  end_time = Time.current.beginning_of_hour + end_hour.hours
  first_hour +=1
  end_hour +=1
  h[start_time] = end_time
  i+=1
end