time_select_range.rb

class TimeSelectRange
  attr_accessor :value

  def initialize(value)
    @value = value
  end

  def formatted(format = "%02d:%02d")
     format % [value / 60 / 60, value / 60 % 60]
  end

  def self.build(start: 0, stop: 86400, step: 15.minutes)
    start.step(stop, step).map {|value| new(value) }.each
  end
end