Reply
It matters in two cases below:
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TN 工作结束时, 开车离开美国, 但美国CBP website上的 I94卡上没有出境记录, 美国CBP认为我非法滞留美国. 将来有麻烦.-In your case, you will reenter US and thus, you will get the new I-94 arrival record (the status record will be re-counted). So, you don't have 非法滞留美国 problem.
- 报税要用在美国的天数. 并且要填写出入美国日期. 但CBP website上 的出入美国日期错了. 美国认为我造假.-You have worked in US and got the salary, so you have to pay the tax no matter how long you stay in US. Why do you care about a few days of stay outside US? Don't think you can save significant money by just not ocunting the days you are out of US.