6 Delicious $3.14 Pizza And Pie Deals For Pi Day In Toronto By Paige McPhee By Paige McPheeView Author|March 14, 2018| If you love pizza, pie, pi or all of the above - today is your lucky day! Mathletes around the world know March 14th as Pi Day simply due to it's numeric date, 3.14 - the first few numbers that... View this article.