Time Zone Converter, World Clock, and Meeting Planner

Written byOleh Soloninupdated 10 September 2026

World Clock

Time zone converter and meeting planner

Compare cities on one shared timeline, move a single cursor through the day, and keep the same view in your browser, account, and URL.

Reference time

18:37

Prague, Czechia / Sep 13

Add city or time zone

Selected cities

Prague

Home

CzechiaUTC+2GMT+2

18:37

Sun, Sep 13

Now: 18:37Previous dayWeekend

New York

United StatesUTC-4EDT

12:37

Sun, Sep 13

Now: 12:37Previous dayWeekend

-1

Shared timeline

Drag the bar to move all cities together

18:37

00:0023:59

Prague

HomeUTC+2

Czechia / GMT+2

18:37

Sun, Sep 13

Now: 18:37

Previous day

New York

UTC-4

United States / EDT

12:37

Sun, Sep 13

Now: 12:37

Previous day

Every participant's local time, side by side

Convert time between cities and see several of them at once on a shared timeline, with daylight saving handled from real IANA rules. Built for scheduling calls.

Convert time between cities here and the two classic scheduling mistakes disappear: a forgotten date rollover, and a summer-time switch one country has already made and the other has not.

Because the switch dates differ — the EU changes on the last Sunday in March, the US in early March — the gap between two cities is not fixed. There are weeks each year when the usual difference is simply wrong.

What this calculator shows

Current local time for every city you add
A shared timeline for finding overlapping working hours
Daylight saving applied from live IANA zone rules, not fixed offsets

What to keep in mind

Uses IANA time zone data, which tracks legislative changes.
Working-hours shading assumes a conventional 09:00–18:00 day.

FAQs

Why did the difference between two cities change?

Daylight saving dates differ by country. The US springs forward in March, Europe on the last Sunday of March, and Australia moves in the opposite direction entirely.

How many cities can I compare?

Several at once. The timeline is designed for finding a slot that suits everyone, which is hard with only two columns.

Do countries without daylight saving simplify things?

For them, yes — but not for you. Japan and India never change, so their gap to Europe shifts twice a year anyway.

Is the underlying data kept up to date?

It uses the IANA database, the same source operating systems rely on, which is revised whenever a country changes its rules.

Worked example

A call between London and New York

Input: London 15:00

Output: New York 10:00

Note: Usually five hours apart — except for two weeks in March and one in autumn, when the countries change clocks on different dates and the gap becomes four or six.

Useful links

All tools in Date & Time World Clock Time Difference

Time Zone Converter, World Clock, and Meeting Planner

Time zone converter and meeting planner

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Useful links