Determine whether given input is a valid date or not

helpers.php

    function is_date($value): bool
    {
        if ($value instanceof DateTime) {
            return true;
        }

        if ((! is_string($value) && ! is_numeric($value)) || strtotime($value) === false) {
            return false;
        }

        $date = date_parse($value);

        return checkdate($date['month'], $date['day'], $date['year']);
    }