Time Zone Converter

Schedule the call for the time other people actually have

Remote teams still send “Let’s talk at 4” without saying whose 4. This time zone converter takes a date and time in one IANA zone and shows it in another. It also shows the current clock in both zones so you can sanity-check whether London is five hours ahead of New York today or four, depending on the daylight-saving weekend.

The conversion uses your browser’s internationalization API. That is the same database that makes your phone alarm correct after a DST change. You do not need an account, and the meeting time never leaves the page.

How conversion works

A local time plus a time zone names a specific instant. The tool interprets your input in the source zone, including that zone’s offset on that calendar date, then formats the same instant in the target zone. If Los Angeles is on Pacific Daylight Time and London is on British Summer Time, the gap is eight hours, not the winter eight-or-nine you might remember from a blog post written in January.

Some zones have half-hour or 45-minute offsets (India, Nepal, Newfoundland). They are in the list because “round hours only” converters create missed standups. If a zone is missing, you can usually pick a city that shares the same IANA rules.

How to use it

Select the source zone (where the time is written), enter the local date and time, then select the target zone. Read the converted date carefully—not only the clock. A 9 a.m. Tokyo meeting is often the previous evening in the Americas.

For a recurring weekly meeting, convert a date that is not on a DST transition weekend if you want the “normal” offset, then re-check in March and November. The current-time row is a live check that your device clock and zone data look sane.

Examples

3:00 p.m. in New York during standard time is 8:00 p.m. in London. 9:00 a.m. in Tokyo is typically 5:00 p.m. or 4:00 p.m. the previous day in Los Angeles, depending on DST. Noon UTC is 7:00 a.m. in New York in winter and 8:00 a.m. in summer.

If you only need the number of calendar days between two dates and not the clock, use the age and date difference calculator instead.

Pitfalls

City names are not offsets. “Arizona” does not do DST the way “Denver” does. “Indiana” used to be a trap; IANA city picks are safer than abbreviations like EST, which people use year-round even when they mean EDT.

This is not a flight itinerary tool. Airlines publish times in local civil time for each airport. Convert each departure and arrival separately if you are trying to see how long you will be in the air.

Typical examples

Frequently asked questions

Does this handle daylight saving time?

Yes. Conversions use the IANA time zone database through the browser’s Intl API, including DST rules for the date you enter—not only “today.”

Why did the date change after conversion?

Crossing the International Date Line or a large offset can land on the previous or next calendar day. The result shows the converted date and time together so that does not hide.

What is the difference between UTC and GMT?

UTC is the civil time standard devices use. GMT is a time zone that usually matches UTC in practice for clocks. This list includes UTC explicitly.

Can I convert a past or future meeting?

Yes. Pick the date and time of the meeting in the source zone. DST rules for that date are applied.

Is my meeting uploaded to a server?

No. The conversion runs in your browser with the time zone data already on your device.