How to Build an International Clock in JavaScript

Best International Clock Apps and Widgets for Travelers

Traveling across time zones makes keeping track of local and home time essential. The right international clock app or widget saves you from missed calls, jet-lag scheduling mistakes, and confusing meeting times. Below are top picks—covering smartphone apps, desktop widgets, and web tools—selected for ease of use, offline reliability, customization, and traveler-friendly features.

1. World Clock by timeanddate.com (Web, iOS, Android)

• Why it’s great: Extremely reliable, comprehensive city database, daylight saving time rules handled automatically.
• Key features: Multiple clocks, customizable city names, sunrise/sunset times, time zone converter, meeting planner.
• Best for: Travelers who want a robust, authoritative source and use multiple platforms.

2. Google Clock (Android) + World Clock (Google Assistant)

• Why it’s great: Native Android integration with alarm and bedtime features, easy voice queries via Assistant.
• Key features: Quick access to world clocks, alarms that adapt to travel, simple UI, integration with Google Calendar for scheduling.
• Best for: Android users who prefer built-in, no-fuss tools.

3. Apple World Clock (iOS) + Widgets

• Why it’s great: Seamless integration into iPhone/iPad, clean widget designs for Home Screen and Lock Screen.
• Key features: Multiple city support, dynamic island/lock screen widgets (on supported devices), Siri integration.
• Best for: iPhone users who want polished widgets with minimal setup.

4. World Clock – Time Zones (iOS, Android)

• Why it’s great: Traveler-focused UI with map view and quick conversion tools.
• Key features: Interactive map, meeting planner, customizable clock list, offline functionality.
• Best for: Frequent travelers who need quick visual mapping of time differences.

5. Clocker (macOS)

• Why it’s great: Simple menubar app that shows multiple time zones with shortcuts and calendar integration.
• Key features: Time zone list in menubar, keyboard shortcuts, calendar event time-zone display.
• Best for: Mac users managing remote meetings across zones.

6. Every Time Zone (Web)

• Why it’s great: Ultra-minimal visual timeline that instantly shows time across zones.
• Key features: Clean, scrollable interface, shareable links to specific times.
• Best for: Quick comparisons and sharing scheduling suggestions with colleagues.

7. World Clock Widget – Clock Widget (Android)

• Why it’s great: Highly customizable Android widget options for home screens.
• Key features: Resizable widgets, different clock styles, color and transparency settings.
• Best for: Users who want a persistent, attractive world clock on their home screen.

How to choose the right app/widget

• Platform: Use native tools (Apple World Clock, Google Clock) for best integration.
• Frequency of travel: Offline support and automatic DST handling matter more for frequent travelers.
• Scheduling needs: If you set meetings across teams, prioritize tools with converters and shareable links (timeanddate, Every Time Zone).
• Customization: If you want clock widgets on your home screen, choose apps with resizable and themeable widgets.

Quick setup tips for travelers

1. Add home and current city to your clock list for fast reference.
2. Enable widgets on your lock/home screen for one-glance time checks.
3. Use a time zone converter when scheduling calls—save common group combinations.
4. Check DST rules in unfamiliar countries (timeanddate handles this automatically).
5. Sync with calendar so event times display correctly in each zone.

Final recommendation

For most travelers, start with timeanddate.com’s World Clock for accuracy and features, plus use your device’s native widget (Apple World Clock or Google Clock) for quick access. Add a customizable widget app if you want a more attractive or persistent display on your home screen.