This plugin extends the jQuery UI datepicker clendar, allowing to select more than one date, picking them one by one or by ranges relative to the clicked date.
Take a look at some demos.
With any of the following package managers:
bower install jquery-ui-multidatespicker
npm install jquery-ui-multidatespicker
yarn add jquery-ui-multidatespicker
Download the zip and place wherever you need it:
For documentation and examples, check the official MDP page.