I Built an Open Source World Clock That Actually Doesn't Suck

Why I Made This (And Why You Might Love It Too)

Hey there! 👋 I'm a developer who got tired of crappy world clock apps. You know the ones - cluttered with ads, slow as molasses, and somehow always showing the wrong time when you need it most.

So I built datetime.app - the world clock I actually wanted to use. It's the alternative to time.is.

What Makes It Different

🚀 It's Actually Fast

I'm talking sub-second load times. No spinners, no waiting around. I optimized the hell out of this thing because I hate waiting, and I bet you do too.

🛠️ Made by a Developer, for Developers

- Unix timestamps? One-click copy. ✅

- ISO 8601 format? Of course. ✅

- Want to know if your system clock is accurate? It checks against world time servers in real-time. ✅

- Clean, predictable URLs for every timezone and city because REST APIs shouldn't be the only things with good endpoints.

🌍 Actually Global (Not Just English)

I spent weeks getting the localization right. When you switch to Chinese, "London" becomes "伦敦" - not some Google Translate mess. 13 languages, properly localized, because the world isn't just English-speaking.

⚡ Built with Modern Tools

Next.js 13+, TypeScript, Tailwind CSS. It's fast, it's clean, and it works on your phone just as well as your 4K monitor.

Why Open Source?

Because I believe good tools should be transparent. No tracking, no data collection, no "premium" features locked behind paywalls. The code is on GitHub, the tool is free, and it'll stay that way.

I built this in my spare time over 3 months because I needed it for my own work coordinating with teams across timezones. Figured other developers might find it useful too.

https://github.com/airyland/datetime.app

TL;DR: It's the world clock app I wish existed when I was Googling "what time is it in Tokyo" for the 100th time this week.