World Time Zone Converter
Coordinate global teams, align cross-border meetings, and compare business hours across multiple cities in real time.
Working Hour Overlaps
Status indicators reveal daytime business availability (8 AM to 6 PM) at a glance, highlighting realistic overlap windows for international conference calls.
Daylight Saving Accuracy
Calculations use native browser IANA time zone databases (Intl.DateTimeFormat), accounting for hemisphere seasonal daylight transitions.
Persistent Layout State
Your preferred comparison cities are saved securely in your browser's localStorage. They load instantly every time you return.
Frequently Asked Questions
How does the time zone converter handle daylight saving time?▼
It uses your browser's built-in time zone database, so each city's current offset, including daylight saving, is correct for the date shown.
How do I find a good meeting time across time zones?▼
Add each city and drag the timeline. The colours show working hours, early or late hours and night for every city, so you can spot the overlap.
How many cities are included?▼
Nearly 400 cities across all regions, plus UTC. Search works with or without accents, so Sao Paulo finds São Paulo and Kyiv is included.
Is the time difference shown as ahead or behind?▼
Each city is compared with your own local time and labelled ahead or behind by the exact number of hours and minutes, including half-hour zones such as India.
Is my data sent to a server?▼
No. The converter runs entirely in your browser, so nothing you enter is uploaded, stored or tracked. Once the page has loaded it keeps working without a connection.