Most developers think age calculation is simple. const age = currentYear - birthYear; Done,...
Age calculation requires handling leap years, timezones, and calendar edge cases beyond simple year subtraction; naive code fails on February 29 in non-leap years. For tech managers: trivial requirements often mask systemic complexity—robust edge-case testing and design rigor are essential before shipping to production.
Most developers think age calculation is simple.
const age = currentYear - birthYear;
Done, right?
Not exactly.
The moment you need an accurate result, things become much more complicated than basic subtraction. Leap years, month lengths, birthdays that haven't happened yet, and date arithmetic can all introduce subtle bugs. Date arithmetic is a well-known source of edge cases in software development.
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