So what SP are you referring to where the dates are identical to the Counterfoil? You don't have a SP yet if you haven't traveled to Canada.
I haven't, but when you were approved the dates for your Study Permit are stored inside of GCMS notes, as well as conditions of it. If you don't believe it that's alright, but this is what I am referring to:
For officer use
TYPE: Permit - SP / Permis - PE
Document number: #000000000
Validity (YYYY/MM/DD): date
Must enter Canada by (YYYY/MM/DD): date
If they would create SP just for you, then imagine how long would they need to prepare it. Your SP is stored in the system and all an officer does it decide whether you are who you actually are and you are doing in Canada what you said you would