Past timing is not a promise about the current process or permission.
Use current milestones
Assess the actual route and evidence before making commitments. A previous admission date does not authorize a new period of work or resolve changes in the proposal.
Starting a longer-term process too early, or alongside a TN renewal, can create questions about consistency that are avoidable with better timing. Allow time to prepare the new employer's evidence file, complete the correct authorization step, and confirm the result before setting a start date. Match each date to proof: a current employer letter, the credential record, citizenship document, and any required licensing evidence. Keep the employer informed about timing in general terms so start dates and travel plans stay adjustable while arrangements are confirmed. Discuss with the employer whether the proposed start date can flex if either step takes longer than expected, and avoid resigning from current arrangements in Canada before the visa step is resolved. Build a two-step timeline rather than a single date: a milestone for the consular appointment, a second for expected issuance, and a buffer before the intended admission and start date. Employers should be told honestly what the realistic earliest start date is, because a date promised on the basis of the immigration step alone will not survive contact with the licensing process.