Simply add jQuery, Materialize & MaterializeDateTimePicker to your site and write this;
MyWebsite/
|--css/
| |--materialize.css
|
|--fonts/
| |--roboto/
|
|--js/
| |--jquery.js
| |--materialize.js.
| |--materializedatetimepicker.js
|
|--index.html
Just click on the text field and see for yourself ☺.