EntityActivities::getLastWeekDay

private function getLastWeekDay(DateTime $daySomewhereInWeek): Date
{
	$date = $this->getUserCurrentDateTime($daySomewhereInWeek);
	$weekStartDay = (int)Application::getInstance()->getContext()->getCulture()->getWeekStart();
	$todayDay = (int)$date->format('w');
	$daysToAdd = ($todayDay >= $weekStartDay)
		? (6 - $todayDay + $weekStartDay)
		: $weekStartDay - $todayDay - 1
	;
	if ($daysToAdd > 0)
	{
		$date->add('+' . $daysToAdd . ' days');
	}

	return Date::createFromTimestamp($date->getTimestamp());
}