Is there any nice (maybe one line) way how to format

`20134859` into `20 - 13:48:59` ??

I started with `"20134859".unpack('a2a*').join(' - ')` but I don't know how to tackle the `:` I was thinking if or how I can split and join(':') the second element that is return from unpack. All in one line.

this works but I am sure there is out there something I'll like more

```
s = "20134859"
"#{s[0,2]} - #{s[2,2]}:#{s[4,2]}:#{s[6,2]}" 

```