PHP ExtraWatchDate::dayOfWeek示例

 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
 }