How can i detect the events?

Hi, i want to know how i can detect the events like in the bootstrap-datepicker: http://bootstrap-datepicker.readthedocs.org/en/latest/events.html?highlight=event#changedate

I want only for the moment know how i can detect the changes in 'ng-model', doesnt work with ng-change. In the doc says the event for that is : **changeDate**
