Timezone Converter

The Timezone Converter shows the same instant across several time zones, so you can schedule a call, meet people in different regions, or line up a deadline without doing the mental math yourself. It also shows the Unix epoch value, which is useful when you are converting between a human readable time and the number a system expects. The tool uses the browser timezone database, which includes daylight saving rules, so the results stay correct through the seasonal shifts. It runs entirely in your browser, so nothing is transmitted. An instant in time is a single point, but the same point reads differently depending on where the reader is, and the offset between zones is not fixed, since many regions shift by an hour for part of the year on different dates. That is why scheduling across regions by mental arithmetic goes wrong, particularly around the weeks when one region has changed its clocks and another has not. Converting an instant across several zones at once turns a guess into a fact and removes the most common scheduling error, which is agreeing on a time that is correct for one participant and an hour off for everyone else. Showing the epoch value alongside is useful because systems store time as an offset free number, so the conversion also answers what a human readable time looks like to the software. The browser timezone database carries the current daylight saving rules, which is what keeps the results correct through the seasonal shifts rather than being right for only part of the year. Everything is computed locally.

📘 Related guide: Convert a time across world time zones →