If we make the very traditionally assumption that the year is a circle (technically it is an ellipse) with a circumference of 365 days (366 on a leap year):
HAPPY PI DAY!
*14 March as Pi Day is superficial fluff that teaches us nothing about π. Tau Day is also silly, especially since τ unnecessarily complicates the calculation of the area of a circle.
The Finch and Pea 
You and your metric stuff. 🙂