New Algorithm Speeds Up Day-of-Week Calculations
Calculating the day of the week for an arbitrary date is a common exercise in computer science, often solved with formulas like Zeller's Congruence. A new writeup from developer Ben Joffe proposes a streamlined approach that reduces the number of operations needed, aiming for both speed and simplicity in code.
The post breaks down the math behind existing methods and shows how careful restructuring of the formula can cut down on branching and lookup tables, making it easier to implement efficiently in low-level or performance-sensitive code.
While niche, this kind of micro-optimization work appeals to developers who enjoy squeezing efficiency out of everyday utility functions, and it's a good showcase of applied number theory in practical programming.