TetraKits
Scheduling a call between New York, London, and Tokyo means three different offsets — and possibly different calendar dates. The TetraKits world clock shows live time for major cities on one page. Add any IANA timezone, no account required.
Overview
Unlike sites that publish a separate page for every timezone, TetraKits gives you one premium world clock. Default cities include your local time, UTC, New York, London, Tokyo, and Sydney. Add Dubai, Mumbai, Singapore, Berlin, or any city from the dropdown.
How to use
- Open the World Clock — clocks update every second.
- Compare times and UTC offsets across default cities.
- Use + Add city to add timezones you need for meetings or travel.
- Remove cities with the × button (local time stays pinned).
For duration within a single day, use the time calculator. For calendar spans, use the date calculator.
Understanding time zones
Each city uses an IANA timezone (e.g. America/New_York) that includes daylight saving rules. UTC is the global reference — offsets like UTC+5:30 (India) or UTC−5 (US Eastern) show how far ahead or behind each zone is. Dates can differ when cities are on opposite sides of the International Date Line.
FAQ
How accurate is the world clock?
Uses browser Intl API with IANA timezone data — same as your OS.
Does it handle daylight saving?
Yes. DST rules are built into IANA data.
Can I add custom cities?
Yes. Pick any timezone from the add dropdown.
Is the world clock free?
Yes. Unlimited cities, no signup, no tracking.
