<link href="https://cdn.jsdelivr.net/npm/flatpickr/dist/flatpickr.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/flatpickr"></script>
<script>
</script>
<div class="input-group datepicker">
<input type="text" class="form-control" data-input aria-describedby="date1">
<div class="input-group-append">
<button class="btn btn-secondary" type="button" id="date1" title="toggle" data-toggle><i class="icon-angle-down-4 mr-0"></i></button>
</div>
</div>