How to enable particular dates using angularJS datepicker directive?

If you're using Datepicker directive from Angular-UI. Check out this thread :

Disable specific dates in Angularjs date picker

If you want to create a custom datepicker directive in Angular :

Assuming you have the algorithm generating a datepicker, you can make a regular datepicker and put a ng-click on each day (using ng-repeat inside week/month) and check if the selected day is a member of your set of numbers in your controller.

You can also use ng-class="{{disabled: checkIfDayIsDisabled()}} on the day element in your html to gray out the disabled dates using css to make it more obvious for the user.

Here's an example how I would implement it :

in your js:

var enabledDates = [1,3,5,7];

$scope.checkIfDayIsDisabled(day) {
    if (!checkIfDayIsDisabled(day)) {
        // executes this only if the day is enabled
    }

$scope.checkIfDayIsDisabled(day) {
    return (check if day is in enabledDates);
}

in your html:

<div ng-class="{{disabled: checkIfDayIsDisabled(day)}}" ng-repeat="day in month" ng-click="selectDay(day)">{{day.date | date:'dd'}}</div>

in your css:

.disabled{
    // your gray out styling
}

Hope this will help you out.