I dont think they can give you a certificate for a day when you were away. Unless you were away 2days in a row, then you can get it for both days. But that would have to mean, you didnt attend school since the day it was due. THis is because doctors can get in a lot of trouble if its found they said they had an appt with you when they didnt. I know this because my dads a doctor and he wouldn't even do it for me ! He made me miss it a second day, took me to another GP and got me a medical cert for both days, so then i got 2extra days for an assessment.... i had a legitimate reason for not having it in on time though, but thats another story.If you could get a doctors certificate you should definately get one... I wonder how you would get one? i.e. what do you say to the GP, "can i get a doctors certificate, cause i jigged school for fun?"
Are there doctors who are willing to sell certificates??