Zero-indexed-months Memes

Nothing quite like that 3 AM panic when you realize you've accidentally scheduled a customer's subscription renewal for a month that doesn't exist. You wanted January 30th, but JavaScript's Date constructor with month index 1 (which is February, because of course months start at 0) and day 30 just... rolls over to March 1st. Because February only has 28 or 29 days, JavaScript just shrugs and says "close enough, here's March 1st." Your customer is now getting charged on the wrong day, your billing system is chaos, and you're lying in bed wondering why you didn't just use a proper date library. Sleep? Not tonight, friend. Tonight you're debugging date logic at 2 AM while questioning every life choice that led you to work with JavaScript dates.