How to compare the current time across world cities

Scheduling across cities is harder than adding a fixed number of hours. Some regions change their clocks seasonally, and they do not all switch on the same dates. A meeting that worked in March can move by an hour for a colleague in October.

Start with named time zones

The world clock shows the current date and time for selected cities. Add your city and the place you want to compare. Read the date as well as the hour: late evening in one city can already be the next day elsewhere.

The page uses your browser’s time-zone database. For a current quick check, that is more useful than memorizing that a city is “always five hours ahead.” For a future appointment, calculate the time on the exact meeting date, because daylight-saving rules may change between now and then.

Keep one unambiguous appointment time

In an invitation, include a date, time, and time zone, or use an ISO 8601 timestamp with an offset. “Thursday at 9” is incomplete. “Thursday 09:00 Europe/London” gives a named zone, while “09:00Z” gives a UTC instant. A calendar invitation can then display the equivalent time for each attendee.

Verify important calls

The clock depends on your device’s system time and the zone rules shipped with its browser. A misconfigured device or old time-zone database can mislead it. Check time-critical travel, broadcasts, and appointments with an authoritative organizer. The city choices stay in this tab and are not sent to a scheduling service.