MongoDB's ISODate() is just a helper function that wraps a JavaScript date object and makes it easier to work with ISO date strings.
You can still use all of the same methods as working with a normal JS Date, such as:
ISODate("2012-07-14T01:00:00+01:00").toLocaleTimeString()
// Note that getHours() and getMinutes() do not include leading 0s for single digit #s
ISODate("2012-07-14T01:00:00+01:00").getHours()
ISODate("2012-07-14T01:00:00+01:00").getMinutes()