Scenario: Already received a study permit. Need to update IRCC of deferral or not? Validity of study permit?

[MyHero]

Hi. If ever one receives approval of a study permit. Must he inform IRCC of such deferral or not? And if not, from what date will the study permit validity begin? Thank you

 

[MyHero]

Up

 

[Bishops2020]

The date the study permit begins is written on the letter of introduction and on the study permit.