How to add time easily in javascript?

Question

JavaScript

Input data - 8:30
To this number you need to add, say, 45 minutes.
The output should output the line - 9:15
How to make it easier / more correct / more elegant?

Answer 1

var time1 = new Date('9.10.2014 8:45')
  , time2 = new Date(+time1 + 45 * 6e4); // => Thu Oct 09 2014 09:15:00