This is a pretty easy question to answer, and calendar arithmetic is not how you do it. If you want to do something, you don't need much math. If you want to d

This is a pretty easy question to answer, and calendar arithmetic is not how you do it. If you want to do something, you don't need much math. If you want to do it WELL, you do. The second you want to optimize something, you need math. Whether you're figuring out the analytics of an A/B test (stats!), or finding the best inputs for optimal outputs (set a derivative equal to 0 anyone?), or making an algorithm more efficient by lowering its asymptotic complexity. You can do stuff. Math just makes it better. Like salt on bland food. Full disclosure: I'm defending my PhD in math in 2 months! My opinions may be biased.