public function getDay($dayOffset, &$start, &$end, $localTimezone = "America/Chicago")
 {
     // get the date/time in local timezone
     $today = new Time("", $localTimezone);
     $today->addDays($dayOffset);
     $this->getDayUtc($today->format("Y/m/d"), $start, $end, $localTimezone);
 }