Here is a very relevant url regarding start and end dates:
Should the TN Visa Petition letter include the starting date
I recommend you list both anyway since some inspectors have been so meticulously picky about this even if technically unjustified and incorrect. Your objective is getting a TN not refused entry. You might be wise to include it given the number of potential TN beneficiaries being denied due to lack of a start/end date on the petitioning letter, particularly on the West Coast including Blaine Truck and Peace Arch crossings.


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