jaarweek + weeknummer
$Week_berekend = date("YW", strtotime(''.$Start_Week.' +'.$Optel_week.' week'));
Code (php)
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<?php
// voorbeeld: http://3v4l.org/YYaXr
$Start_Week = '201338';
$Optel_Week = 8;
$start = new DateTime();
$start->setISODate(substr($Start_Week, 0, 4), substr($Start_Week, 4, 2));
echo $start->format('Y-m-d'), PHP_EOL;
$start->add(new DateInterval(sprintf('P%dW', $Optel_Week)));
echo $start->format('Y-m-d'), PHP_EOL;
?>
// voorbeeld: http://3v4l.org/YYaXr
$Start_Week = '201338';
$Optel_Week = 8;
$start = new DateTime();
$start->setISODate(substr($Start_Week, 0, 4), substr($Start_Week, 4, 2));
echo $start->format('Y-m-d'), PHP_EOL;
$start->add(new DateInterval(sprintf('P%dW', $Optel_Week)));
echo $start->format('Y-m-d'), PHP_EOL;
?>
$Week_numbers= substr($Start_Week, 4, 6);
$Start_Week_berekend = date("YW", strtotime("{$Year_numbers}-W{$Week_numbers}+$Optel_Week week"));
Dit doet dan toch hetzelfde?