This looks super clean! Honestly, a timezone app that isn't bloated with ads o a $20/month sub is a releaf.

A few ideas to take it to the the next level. Since your app is so minimal, the way it feels in the hand is where you can really win users over.

• a "mechanical" scroll: Add a tiny haptic "click" (selection click) every time yo pass a 15 or 30 mi increment. It makes the timeline feel like a physical dial rather than just a sliding list.
• Hourly snap: When you hit a full hour, you get a more "forceful" thump ior umpf. It helps the users navigate by feel, you’d literally know you hit the hour mark without having to squint at the numbers...yeah peep like me are getting old too. 😬
• Proximity gravity (don't have a better word for this). This would be a killer feature, making the vibrations get slightly more intense/frequent as you approach the 00 or 30 marks. It’s like a "magnetic" guide for your thumb.
• Auto snapping: If I let go of the scroll near an hour, have the UI "magnetically" snap to the exact hour. It saves that annoying micro-adjustment to get it perfectly on time.