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<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://unpkg.com/js-datepicker"></script>
<link rel="stylesheet" href="https://unpkg.com/js-datepicker/dist/datepicker.min.css">
</head>
<body>
<input type="text" class="some-input" >
<script>
let dataApi = [new Date('2020-11-16'), new Date('2020-11-19')];
const picker = datepicker('.some-input', {
alwaysShow: true,
disabler: d =>!dataApi.map(v => v.setHours(0)).includes(d.getTime())
})
</script>
</body>
</html>