How to Convert Meeting Times Between Time Zones

Scheduling across timezones goes wrong twice a year, when one country changes clocks and the other has not yet — or never does. A fixed offset you memorised in January is wrong in April.

What the Time Zone Converter does

Converts a specific date and time between timezones using the IANA timezone database built into your browser.

Because it uses real timezone rules rather than fixed offsets, daylight saving is handled for the actual date you enter — including the weeks when two regions have switched and the other has not.

Open the Time Zone Converter and follow the settings and checks below.

Why offsets are not enough

Setting	What it means
Source of rules	The IANA timezone database, built into your browser
Daylight saving	Applied automatically for the date you enter
Why the date matters	The offset between two zones changes across the year
Northern switch	Usually March and October/November
Southern switch	The opposite months — offsets can move by two hours
No daylight saving	Much of Asia and Africa, and Arizona in the US
Clock source	Your device

How to use it

1. Enter the date and time, not just the time — the date decides the offset.
2. Pick the source and target timezones.
3. Read the converted time.

Practical advice

The dangerous window is the few weeks each spring and autumn when one region has changed clocks and the other has not. The usual gap between London and New York is five hours, but for about two weeks a year it is four. Meetings booked on a remembered offset land an hour out, and only in that window.

Common questions

Why does the offset change depending on the date?

Daylight saving. Regions switch on different dates, and some never switch at all, so the gap between any two zones is not constant. That is exactly why entering the date matters as much as the time.

Which timezone should I use for a country with several?

Pick the city rather than the country. The US spans six zones and Australia three, so "US time" is meaningless — IANA names are city-based for this reason.

Is my device’s clock used?

For the current time, yes. The conversion rules come from the timezone database rather than your clock, so an incorrect device time shifts the starting point but not the arithmetic.

How should I write a time for an international invite?

Include the timezone abbreviation and the UTC offset, and let calendar software do the conversion. Sending a bare "3pm" to a global team is how meetings get missed.

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Vootkit provides a browser calculator and educational guidance. Results depend on the values and units you enter, so verify important financial, academic, safety or professional decisions with an appropriate authoritative source.