Hey Product Hunt 👋 I'm Shahid, a frontend developer from Mumbai, and I built Time Zone Pro because I was tired of doing time zone math in my head. Every time I had to set up a call with people in other countries, I'd end up with three tabs open, Googling "3pm IST in PST" and still second guessing myself. Most world clock apps just show you the current time. That's not the question I'm asking. I want to know "if it's 9pm for me, what time is it for everyone else?" So the whole app is built around one idea: a single 24 hour slider. Drag it, and every city updates together. Day and night indicators make it obvious who's awake and who you'd be waking up. A few things I cared about: • Your local time zone is picked up automatically • 12h or 24h, your choice • Reorder cities so the people you talk to most sit at the top • Works on iPhone, iPad and Mac • No account, no sign up, free to use. There's an optional one time Pro unlock for extra themes, no subscription I'd love your honest feedback. What cities are you juggling every week, and what's the one thing you wish your world clock did better? I'll be here all day replying to every comment 🙏

Time Zone Pro: World Clock

Drag one slider and see the time in every city

Drag one slider and see the time in every city