我的offer letter和TN support letter写的start date是2010/09/07。但我的TN签发日期是2010/08/21。请问我在2010/09/07之前还能否用原来持有的H1B继续为原公司（H1B sponsor）工作2周，
-You are fine to work for the old employer until the TN is effective.
因为我现在还没有通知公司辞职。本来计划再呆2周。
也就是说，是否TN生效那一刻起，H1B就失效？
-Yes.
或者说，TN生效是从海关issue那一刻开始，
还是从新公司第一天上班开始？
-Yes, the effective date of TN is indicated in your job offer letter.
有没有官方文件可以referred给原雇主（H1B sponsor）？
-No. Your change of status from H1 to TN is irrelevant to your h1 sponsor.
昨天我在海关时，officer很seriously问我，你是否已经结束现在的工作，我当时只能说yes；然后他说，要是我现在打电话给你的公司，他们会说you are done with the company，我只好说OK。因此有此担心。。。
-I do not think you will have a problem.
-You are fine to work for the old employer until the TN is effective.
因为我现在还没有通知公司辞职。本来计划再呆2周。
也就是说，是否TN生效那一刻起，H1B就失效？
-Yes.
或者说，TN生效是从海关issue那一刻开始，
还是从新公司第一天上班开始？
-Yes, the effective date of TN is indicated in your job offer letter.
有没有官方文件可以referred给原雇主（H1B sponsor）？
-No. Your change of status from H1 to TN is irrelevant to your h1 sponsor.
昨天我在海关时，officer很seriously问我，你是否已经结束现在的工作，我当时只能说yes；然后他说，要是我现在打电话给你的公司，他们会说you are done with the company，我只好说OK。因此有此担心。。。
-I do not think you will have a problem.
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