$weekend_start = 6 - $this->weekStartDay; // Saturday by default.
$weekend_end = (7 - $this->weekStartDay) % 7; // Sunday by default.
if (defined('WEEKEND_START_DAY')) {
$weekend_start = 6 - $this->weekStartDay; // Saturday by default.
$weekend_end = (7 - $this->weekStartDay) % 7; // Sunday by default.
if (defined('WEEKEND_START_DAY')) {