Here's an example that transforms the array to a String and displays it as a string directly in the page:
JS:
$scope.selectedDaysToString = function() {
return $scope.day.join(', ');
}
HTML:
{{selectedDaysToString()}}
And here is an example that generates a list containing all the selected days:
HTML:
<ul>
<li ng-repeat="d in day">{{d}}</li>
</ul>