angular moment date time picker timezone directive issue

The following code shows a date time picker in a form and i am using angular-moment-picker plugin as picker. When i pick a certain date/time it shows right time in the picker input box, but after the form is submitted the time entered in db is lagging behind. So i used a timezone directive from a stackoverflow answer. But it throws viewValue.getMinutes is not a function error

<div moment-picker="startTime" class="form-control"  name="startTime" 
  ng-model="shiftTimings.startTime" format="YYYY-MM-DD HH:mm:ss" datepicker-localdate > 
      </div>

Directive

app.directive('datepickerLocaldate', ['$parse', function ($parse) {
        var directive = {
            restrict: 'A',
            require: ['ngModel'],
            link: link
        };
        return directive;

        function link(scope, element, attr, ctrls) {
            var ngModelController = ctrls[0];

            ngModelController.$parsers.push(function (viewValue) {

                viewValue.setMinutes(viewValue.getMinutes() - viewValue.getTimezoneOffset());

                return viewValue.toISOString().substring(0, 10);
            });


            ngModelController.$formatters.push(function (modelValue) {
                if (!modelValue) {
                    return undefined;
                }

                var dt = new Date(modelValue);

                dt.setMinutes(dt.getMinutes() + dt.getTimezoneOffset());
                return dt;
            });
        }
}]);

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/17/angular-moment-date-time-picker-timezone-directive-issue/
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