🕐 Timezone Converter ☆

Overview

Timezone Converter converts any date and time between timezones accurately. Pick a date, choose the source and target zones, and get the converted time with its UTC offset and the exact difference in hours and minutes, daylight saving is applied automatically for the selected date using the IANA database built into your browser. A live world clock shows the current time in UTC, New York, London, Berlin, Dubai and Tokyo, updated every second with a day indicator when the date differs. Useful for remote teams, travel planning, flight times, support coverage and scheduling calls across regions. Everything runs locally; nothing is uploaded.

How timezone conversion stays accurate

Conversion uses the IANA timezone database built into your browser, so historical and future daylight-saving transitions are applied for the exact date you choose. Not for today. Each zone is resolved to its offset at that instant, and the difference is shown in hours and minutes, including the rare 30- and 45-minute offsets. The world clock row shows the current time in several zones with day indicators, which removes the ambiguity of "is it today or tomorrow there".

Formats, limits and parameters

Property	Timezone converter behavior
Database	IANA tzdata via the browser Intl API
Conversion	Any date/time between any two zones, DST-aware
Outputs	Converted time, UTC offset, exact difference
World clock	Live time in UTC plus major zones, updated every second
Processing	100% client-side; nothing uploaded
Cost	Free, no account, no ads

Privacy: dates stay in the browser

Schedules and travel dates are personal context. All conversion is computed locally with the browser's own timezone data: nothing is transmitted, stored or logged, and the page works offline.

Scheduling across zones

• Convert the specific date, not today, DST rules change the offset.
• State the zone name in invitations (Europe/Berlin) rather than an abbreviation like CET.
• Watch the day indicator: a 2 PM call in New York is the next day in Tokyo.
• Prefer zones without DST for recurring meetings where possible.
• Double-check midnight and midday boundaries. They are the classic off-by-one errors.

Related: browse all calculators for dates, time differences and planning.

Time zones, DST and scheduling across regions

Time zones are political, not mathematical, and that is why conversions break in ways people do not expect. The offset from UTC is not fixed: it changes with daylight saving rules that differ by country and can change with little notice. Names are safer than offsets, so the IANA identifiers such as Europe/Berlin or America/New_York should be stored instead of abbreviations like CET, which are ambiguous. Not every zone is a whole hour from UTC: India is +5:30, Nepal +5:45, and parts of Australia and Canada use half-hour offsets, which is why a meeting at 09:00 in one place can start at :30 elsewhere. The international date line means the same instant can be a different calendar day on each side, so scheduling tools must show the date, not just the time. Daylight saving creates two edge cases: the hour that is skipped when clocks move forward, and the hour that repeats when they move back, where a local time is genuinely ambiguous until an offset is specified. For recurring meetings, store the time zone with the rule rather than a fixed offset, otherwise every participant drifts by an hour twice a year. ISO 8601 strings that include the offset, for example 2026-03-01T09:00:00+01:00, remove ambiguity in logs and APIs. The converter runs in your browser and stores nothing.