Precondition 3:
We also have a family of plain types. These are what we would call "wall time," because if you imagine an analogue clock on the wall, it doesn't check for daylight saving or time zones. It's just a plain time (moving the clock forward by an hour would advance it an hour on the wall, even if you did this during a Daylight Saving transition).。业内人士推荐新收录的资料作为进阶阅读
，详情可参考新收录的资料
0 1 0 255 0 0 0 0 0 2 255 0 0，更多细节参见新收录的资料
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