moose;329181 wroteI'm not quite getting what you mean by rolling due dates.
The no late penalty thing in Ontario schools always boggled my mind too.
rolling due date (or sliding due date) is when the students have an entire week to hand in the assignment. for example, students are given an assignment on Sept. 10th and they have two weeks to work on it. the rolling due date is then Sept. 24th-Sept. 28th. after the week, if the assignment is not handed in, it's a zero. this obviously doesn't solve every problem with zeroes and late penalties but it does help.
some teachers like to give mark or percentage deductions per day or per week an assignment is late. we're not allowed to do that either though anymore. you can also combine this practice with rolling due dates, however, i don't agree with the deduction of marks in this way.
btw, this is a big debate right now in our education system with teachers on both sides of the fence.