First Day Of Week

The eternal holy war of array indexing. Programmers are divided into two camps: those who believe weeks should start on Monday (index 0) like ISO standard, and those who think Sunday (index 0) makes sense because... America? Meanwhile, JavaScript's Date object betrays everyone by making Sunday index 0 but Monday index 1. The real crime here isn't the starting day—it's that we're all wasting precious debugging hours arguing about it instead of fixing that memory leak nobody wants to touch.