A person has a watch and an alarm clock. The watch is 30 seconds behind the alarm clock and the alarm clock is 30 seconds ahead of standard time. At 12 o'clock, what is the difference between the time displayed on the watch and the standard time?
某人有一块手表和一个闹钟，手表比闹钟每小时慢30秒，而闹钟比标准时间每小时快30秒，如果在标准时间中午12时正把手表拨准，那么到第二天中午标准时间12时正，手表显示的时间和标准时间相差多少？
<result>6</result>