The js and css files had been changed to the suit Bootstrap v4.

Since Bootstrap 4 removed the glyphicon, I replaced all icons with font-awesome v4, please includes the font-awesome css as well.

You can override font icon class like this -

// Using font-awesome 5 icons $.extend(true, $.fn.datetimepicker.defaults, { icons: { time: 'far fa-clock', date: 'far fa-calendar', up: 'fas fa-arrow-up', down: 'fas fa-arrow-down', previous: 'fas fa-chevron-left', next: 'fas fa-chevron-right', today: 'fas fa-calendar-check', clear: 'far fa-trash-alt', close: 'far fa-times-circle' } });

Click here for the official usage documentation.

npm install pc-bootstrap4-datetimepicker 

• JS DOM class name control
• CSS stylesheet
• Replaced glyphicon with font-awesome icons