Time Zone Converter — World Clock

Remote teams, international calls, and API logs all share the same problem: a time that is perfectly clear in one city is ambiguous everywhere else. Time Zone Converter takes a date and time in any of 40 curated IANA zones and shows the equivalent moment in up to 8 other zones simultaneously, including the UTC offset and the daylight-saving abbreviation for each one. No server call, no sign-up — the browser’s built-in Intl.DateTimeFormat API does all the work.

Click Use current time to sync the input to right now, or type any past or future date. Change a target zone and the converted times update instantly. Every converted time has its own Copy button so you can drop the result straight into a calendar invite or a message.

Worked Example: A Meeting Across Four Cities

Set the source to 14:00 on any weekday, UTC. The five default target zones return: New York 10:00 EST (UTC-5), London 14:00 GMT (UTC+0), Paris 15:00 CET (UTC+1), Kolkata 19:30 IST (UTC+5:30), and Tokyo 23:00 JST (UTC+9). The Kolkata row is the one that surprises people: India Standard Time is a 30-minute offset, so the minutes column never matches the others. Change the source zone to New York and every other row shifts by 5 hours, showing why "let’s meet at 3 pm" needs a zone attached before it means anything.

What Each Result Column Shows

• UTC offset (e.g. UTC+5:30 or UTC-8) is shown beside every converted time. The offset is computed for the exact date you entered, so a zone that observes DST will show its summer offset in July and its winter offset in January.
• Abbreviation (e.g. EST, BST, AEDT) appears in parentheses when the engine can return one. Generic abbreviations like GMT+5:30 appear on some platforms when the zone has no widely-agreed short name.
• Half-hour and quarter-hour zones are handled correctly. Kolkata (UTC+5:30), Kathmandu (UTC+5:45) and Tehran (UTC+3:30 / UTC+4:30 in summer) all carry the right minute component.

Edge Cases Worth Knowing

• Maximum 8 target zones. The Add Time Zone button is hidden once you hit 8. Remove any row with the trash icon to make room for another.
• DST gaps and folds. On the night a clock springs forward, times between 02:00 and 03:00 do not exist in that zone; the browser’s IANA engine picks the post-transition equivalent rather than returning an error. On the night a clock falls back, the same local time occurs twice. The tool shows whichever the engine resolves to, and the displayed offset confirms which side of the fold you are on.
• Phoenix never observes DST. Arizona (America/Phoenix) stays at UTC-7 year-round while Los Angeles (UTC-8 / UTC-7) shifts, which means the two zones are 1 hour apart in winter and the same offset in summer. The tool reflects this automatically.