Users can submit times

![image](https://cloud.githubusercontent.com/assets/8669803/5271427/33bd0e2c-7a42-11e4-8bd1-1fac69bf4c7d.png)

![image](https://cloud.githubusercontent.com/assets/8669803/5271431/382ced42-7a42-11e4-9ef1-90c19933b428.png)

not sure if these [0..1] [3..4] are magic numbers

instead you could do 
```ruby
hours, minutes, seconds = time.split(":").map(&:to_i)
```