Time Zone ConverterPrivacy: runs locally
World clock, multi-city planner, meeting scheduler with overlap detection, DST warnings, and shareable links.
| City | Time Zone | Local Time | Date | Offset |
|---|
—
Working hours
Overlap (all)
Outside hours
Upcoming DST transitions for your selected cities (next 12 months).
Add City
How It Works
This tool uses the browser's Intl.DateTimeFormat API backed by the IANA Time Zone Database. All DST transitions, historical offsets, and UTC conversions are handled natively — no external API needed.
- World Clock — live-updating clocks for your selected cities, with UTC offset and DST indicators
- Multi-City Planner — pick a date/time and see what it is simultaneously in all your cities
- Meeting Planner — 24-hour timeline showing working hours per city, with overlapping hours highlighted in green
- DST Warnings — automatically detects upcoming DST transitions for all selected cities within the next 12 months
- Shareable Links — URL updates in real-time with your city selection; share it to send your exact configuration