I Spent Weeks Building a Clock for Global Stock Market Hours

And a 20-Year Trader Didn't Laugh. We live in the era of AI agents and overnight startups, "10x your productivity" threads, Full trading platforms with heat maps, AI signals, and blinking dashboards. And I built... a clock. A global stock market clock. And it turned out to be much more complicated than I expected. TL;DR: I built a simple global stock market hours tracker because I was tired of noisy trading dashboards. It became a lesson in time zones, scope creep, and why shipping beats perfection. It Started With a Simple Question Last year my son asked for a trading account. After some evaluation (and strict limits), I opened one for him. I tried mentoring. Mixed results. At least I convinced him not to start with crypto. But one thing became obvious immediately: Markets open and close. And if you don't know when, you're already behind. And yes — he still has some money left on his account. Which I consider a success metric. "Surely This Exists" I just wanted to know: Are US markets