Laravel 表单验证规则`Date`无法验证相对时间格式?

    /**
     * Validate that an attribute is a valid date.
     *
     * @param  string  $attribute
     * @param  mixed   $value
     * @return bool
     */
    public function validateDate($attribute, $value)
    {
        if ($value instanceof DateTimeInterface) {
            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']);
    }Copy