Zellio.io

Timezone Converter

Compare times across cities and plan meetings — DST-aware, like World Time Buddy.

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Frequently asked questions

Does it handle daylight saving time?

Yes. It uses the IANA time-zone database, so offsets automatically reflect daylight saving changes for each city you add.

Are my saved cities private?

Yes — your selected time zones are stored locally on your device, not on a server. The list of cities and timezones you add is saved to your browser's local storage, so next time you visit the tool, your saved cities reappear automatically. Because the data stays on your device, there's no privacy concern — no company knows which cities or timezones you regularly use. You can clear your saved cities anytime by clearing browser data, or keep them permanently for quick access to frequently needed timezone comparisons.

Is this a World Time Buddy alternative?

Yes. It compares times across cities for meeting planning, free of accounts and clutter, and works fully in the browser. Like World Time Buddy, this tool lets you add multiple cities and see their times side-by-side, making it easy to find meeting slots that work for distributed teams. Unlike World Time Buddy, there's no account required, no login wall, and no premium features hidden behind a paywall. The browser-based tool is instant and works offline, perfect for quick timezone checks without any friction or signup process.

Pro tips

  • Add 5+ cities across timezones and see clock times update simultaneously to find optimal meeting times without math.
  • Convert specific times/dates forward and backward across DST boundaries to catch scheduling conflicts before they happen.
  • Use quick-add buttons for common zones (UTC, EST, PST, IST) to avoid typing long timezone names.
  • Share calendar invite with converted times to ensure remote teams know exactly when the meeting happens in their local zone.

About Timezone Converter

Offsets are resolved against the date you choose rather than stored as fixed numbers, so a meeting that lands the far side of a daylight-saving change shows the offset that will actually apply on the day, not today's.

Compare the current or a chosen time across multiple cities to plan calls, meetings and launches across the world, with daylight saving handled automatically. Add the zones you care about and see at a glance which slots fall inside everyone's working hours.

The converter uses the full IANA time-zone database, so offsets and daylight-saving rules match what the calendar will actually do on the day. Your selected zones are remembered, which makes it a quick, distraction-free alternative to World Time Buddy.

The gap between two cities is not a constant, which is the assumption most scheduling mistakes rest on. Europe and North America both shift their clocks several weeks apart, so for a few weeks each spring and autumn London and New York are four hours apart rather than the usual five. The southern hemisphere runs opposite: Sydney enters daylight saving as Europe leaves it, swinging the London gap between eight and eleven hours across the year.

Two further details catch people out. Not every zone is a whole number of hours from UTC — India is UTC+5:30, Nepal UTC+5:45, parts of Australia UTC+9:30 — so arithmetic that assumes whole hours produces meetings half an hour out. And abbreviations are ambiguous: CST is Central Standard Time in North America, China Standard Time and Cuba Standard Time, spanning fourteen hours. Agree times against a named city or UTC rather than an abbreviation.

For anything recurring, store the zone rather than the offset. A meeting saved as UTC+1 silently becomes wrong the day the clocks change, while one saved as Europe/London stays correct because the rules travel with the name. The IANA database is updated several times a year as governments change their minds about daylight saving, and naming the zone is what lets those updates reach your calendar.

Common use cases

  • Global product teams scheduling daily standups across 8+ timezones by checking when it's 9am-5pm for all participants.
  • Software companies coordinating international client calls by converting deadlines and demo times to prevent timezone confusion.
  • Recruitment teams scheduling interviews with candidates across continents and automatically suggesting convenient times for both sides.
  • Event organizers broadcasting webinars and streaming events with converted times for worldwide audiences in local timezones.
How it comparesUnlike world-clock.net which only shows current time, our converter includes historical DST rules and meeting planner matching, offering more accuracy than Google Calendar's basic timezone conversion and more user control than WorldTimeServer's simple lookup interface.