Time zone converter

Pick an origin city and a destination city. ZoneShift will show the current local time in each, the difference between them, and a recommended overlap window for scheduling a synchronous meeting.

How the converter works

The conversion uses PHP's bundled IANA time zone database. When you pick two cities, the page looks up each city's IANA identifier (for example America/New_York or Asia/Tokyo), asks PHP for the current UTC offset of each zone — already adjusted for daylight saving — and reports the difference in hours.

This is more reliable than reading off a static "UTC+9" label because daylight saving status changes during the year. A city like Auckland is at UTC+13 during the southern-hemisphere summer and UTC+12 in winter; ZoneShift always shows you the offset that is in effect right now.

For a quick comparison without filling in a form, you can also visit any city's individual page (for example browse the cities list) — every city page already includes a built-in overlap table against several other major hubs.