code: public static long nextThursdayMidnightPlus(long now, long plus) {
  		long next = (now + timeZoneOffset) / WEEK * WEEK - timeZoneOffset;
  		next += plus;
  		if (next < now) {
  			next += WEEK;
  		}
  		return next;
  	}
docs: Get next time (Unix time in milliseconds) in a week<p>
  E.g. xqbase.com will restart website every Monday's 4:00am, so the next restart will happen at:<p>
  <code>nextThursdayMidnightPlus(now, 4 * DAY + 4 * HOUR)</code> (Monday is the 4th day after Thursday)
  
  @param now current time (Unix time in milliseconds)
  @param plus milliseconds after Thursday midnight