title: moment js: custom format string to day duration
body: <p>I'm have a rather wiered string with time. Something like this - <code>"2.23:59:59.99"</code>. That means that first number before dot is a day count (2 days) and other is a time count - 23 hours 59 minutes 59 seconds and 9900 - milliseconds (or maybe 99 milliseconds). So I need to convert it to decimal number, like <code>2.99</code>. How can I do it using moment.js ?</p>