static function getWeekStartingDay($week = 0)
{
ExtraWatchLog::debug("getting week starting day: " . $week);
if (!$week) {
$weekDiff = 0;
} else {
$currentWeek = ExtraWatchDate::getCurrentWeek();
// OK
$weekDiff = $currentWeek - $week;
// difference between selected week number since 1.1.1970 and current week number
ExtraWatchLog::debug("current week: {$currentWeek} weekDiff: {$weekDiff}");
}
$dayOfWeek = ExtraWatchDate::dayOfWeek();
$dateToday = ExtraWatchDate::jwDateToday();
return $dateToday - $dayOfWeek - $weekDiff * 7 + 1;
// +1 to make it start on monday
}