Bedtime Calculator

bedtime.rb

def wakeup_tomorrow hour, minute
  now = Time.now
  @wakeup_time = Time.local(now.year, now.month, now.day + 1, hour, minute)
  "Wakeup at #{@wakeup_time.hour}:#{@wakeup_time.min}"
end

def sleep_for hour, minute
  @bedtime = @wakeup_time - hour * 3600 - minute * 60
  "Bedtime at #{@bedtime.hour}:#{@bedtime.min}"
end

wakeup_tomorrow 9, 15
# => "Wakeup at 9:15"

sleep_for 7, 30
# => "Bedtime at 1:45"