Reference
Updates every second. Daylight saving time is handled automatically.
World clock
Times in the cities below, with the difference from the base city.
Add a city
What time is it in New York right now? If I want to meet someone in London, what time is that in my own time zone? Whenever you deal with overseas clients, offices, family, or friends, working out the time difference is a recurring chore — and daylight saving time makes it easy to get wrong. This time zone converter and world clock shows the current time in major cities such as Tokyo, New York, London, Los Angeles, Singapore, and Sydney side by side on one screen, with the time difference from a base city (+9h, −5h, and so on) and the date offset (next day or previous day) at a glance. You can freely add or remove cities from a region-grouped list and switch the base city. For scheduling meetings and international calls, the "pick a time" mode is handy: enter a date and time in the base city, and the local time in every listed city updates at once, so you can immediately check whether it falls in the middle of the night for the other side. All time zones are based on the IANA time zone database, and daylight saving transitions and each country's standard time are handled automatically by your browser, so the times stay accurate for any moment. The clocks update every second. Nothing you enter is ever sent to a server; everything is computed entirely inside your browser.
How to use
- Choose the base city (for example, Tokyo). Every city's difference is shown relative to this base.
- Add the cities you want to compare from the "add a city" list. Remove any city with the ✕ button.
- To plan a meeting, switch to "pick a time" and enter a date and time in the base city; the local time in every city updates at once.
FAQ
Is what I enter sent to a server?
No. All time calculation runs inside your browser; the cities you choose and the date/time you enter are never uploaded, stored, or transmitted. It works fully locally.
Is daylight saving time taken into account?
Yes. Each city is computed from its IANA time zone name, and daylight saving transitions as well as changes to each country's standard time are handled automatically by your browser. The displayed differences and local times stay correct even during DST periods.
What do labels like "+1d" and "−1d" mean?
They show that the calendar date differs from the base city. "+1d" means that city is one day ahead of the base city (already the next day), and "−1d" means it is one day behind (still the previous day). Large time differences cross the date line, so this marker helps you avoid getting the meeting day wrong.
How do I use the meeting planner?
Switch to "pick a time" mode and enter a date and time in the base city (for example, 10:00 on June 10 in Tokyo). The local time in every listed city appears at once, so you can pick a slot while checking it is not too early or too late for the other side.
Can I add cities or change the base?
Yes. Add any city from the region-grouped "add a city" list, and remove one with its ✕ button. You can switch the base city at any time, and the differences are recomputed relative to that base.