WorldTime

A timezone scrubber app that lets you visualise time across cities with an interactive dial.

Why a Dial?

Most timezone apps use static displays or linear sliders. But time is cyclical — so WorldTime uses a dial interaction that mirrors how we actually think about time. Rotating the dial scrubs through hours, and concepts like “yesterday” and “tomorrow” become intuitive as you cross midnight.

Features

• Interactive dial for scrubbing time across all added cities
• Auto-detect user’s city via location services
• Search and add up to 5 cities
• Visual indicators for day changes (Today, Yesterday, Tomorrow)
• Clean list layout for scanning times at a glance

Architecture

WorldTime follows the MVVM pattern:

Layer	Component	Responsibility
Model	CityTime	Data structure for city and timezone
View	ContentView, TimeRow, EmptySlot, TimeDialView	UI rendering
ViewModel	TimeViewModel	Time logic and scrubbing state
Service	LocationManager	Location permission and reverse geocoding

Tech Stack

• SwiftUI — Declarative UI framework
• CoreLocation — Location services and geocoding
• Combine — Reactive state management via @Published
• Foundation — Date formatting and timezone handling

Requirements

• iOS 17.0+
• Xcode 15.0+

Getting Started

1. Clone the repository

   git clone https://github.com/runorhasit/WorldTime.git
   

2. Open WorldTime.xcodeproj in Xcode
3. Select a simulator or connected device
4. Build and run (⌘R)

Future Improvements

Medium Priority

• Swipe to delete cities
• Drag to reorder cities
• Haptic feedback on dial interaction

Low Priority

• Dark mode support
• Accessibility (VoiceOver, Dynamic Type)
• iPad and landscape layouts

Case Study

Read the full design and development story: WorldTime: From Slider to Dial, Visualising Time the Way We Think About It

License

MIT License — see LICENSE for details.

Author

Built by Runor Jiroma as a learning project to explore SwiftUI development.

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