node-holidays
cal = holidayslocale 'cz'consolelog JSONstringify calfind "2015-09-28T00:00:00.000"# {"start":"2015-09-27T22:00:00.000Z","end":"2015-09-28T22:00:00.000Z","name":"Den české státnosti"} consolelog calfindAfter "2014-12-24T21:59:00.000"# Sat Dec 27 2014 00:00:01 GMT+0100 (CET)