[AngularJS] How to call a custom directive function written in directive isolated scope into the controller where it is being used.

[ravindar sharma]

I am having a custom datepicker and used two way data binding and want to 
reset it's value from controller.

I have one clear function inside the directive's scope and want to call 
this method from controller so that it's value gets reset to blank.

ds.directive('datePicker', function() {
    return {
        restrict: 'E',
        scope: {
            date: '='
            
        },
        templateUrl: 'js/directives/date-picker.html',
        link: function(scope, elem, attrs) {
            scope.dt = null;

            if (scope.date !== undefined && scope.date !== null) {
                scope.dt = Dates.stringToDate(scope.date);
            }
            
            else{
            scope.dt = null
            }
            scope.clear = function () {
                scope.dt = null;
                
            };


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