public static Long getSunday() {
		cal.setTimeInMillis(System.currentTimeMillis());
		cal.add(Calendar.DATE, -dayOfWeek() + 7);
		return cal.getTimeInMillis();
	}
public static Long getSunday ( ) { cal . setTimeInMillis ( System . currentTimeMillis ( ) ) ; cal . add ( Calendar . DATE , - dayOfWeek ( ) + 7 ) ; return cal . getTimeInMillis ( ) ; }
获取给定时间的周日的长整形表示
@return