a) 3/14 = 0.21428571428 b) If I take reasonable date formats, it's date 2024-03-14 = 2007 today

But kudos for only taking the first three digits, 3.14, as approximation for pi, which is in nearly all cases enough. Some friends in automotive engineering even tried using pi = 3 and 2*pi = 7 for a while, and the results were good enough.