Free Unix Timestamp Converter

The Unix Timestamp Converter is a free online tool that converts Unix epoch timestamps to human-readable dates and vice versa.

Yes, it is completely free with no registration required. All conversions happen client-side in your browser.

A Unix timestamp is the number of seconds elapsed since January 1, 1970 (UTC), commonly used in programming and databases to represent dates and times.

Absolutely. The Unix Timestamp Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Unix Timestamp Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Unix Timestamp Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Unix Timestamp Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Both measure time from the same Unix epoch (January 1, 1970, 00:00:00 UTC), but at different resolutions. A timestamp in seconds counts whole seconds and is 10 digits today, like 1700000000. A timestamp in milliseconds counts thousandths of a second and is 13 digits for the same instant, like 1700000000000 — exactly 1000 times larger. JavaScript's Date object and many JSON APIs use milliseconds, while Unix systems, databases, and most programming languages default to seconds, which is a common source of off-by-1000 bugs. This converter auto-detects the unit for you: anything longer than ten digits is treated as milliseconds, so you can paste either format without specifying which it is. Drop your value in above and it shows both the seconds and milliseconds form side by side.

The Year 2038 problem, or Y2K38, is the moment a signed 32-bit integer used to store Unix time overflows. The largest value such a counter can hold is 2147483647, which corresponds to January 19, 2038, at 03:14:07 UTC. One second later the counter wraps around to a large negative number, and systems still using 32-bit time fields would misread the date as December 1901. Modern 64-bit systems push this limit billions of years into the future, so the risk today lives mostly in legacy hardware, embedded devices, and old database columns. You can see exactly when the rollover happens here: the converter includes 2147483647 as a one-click common reference, letting you confirm how your own tools render that boundary instant. Paste it above to check it yourself.

A Unix timestamp carries no timezone of its own — it is a single integer measured in UTC, which is exactly why it works as a neutral source of truth. To read it in a local zone you apply that zone's UTC offset to the same instant. This tool does that automatically through its World Clock: paste or copy a timestamp and it shows the matching wall-clock time across multiple zones at once. It ships with UTC, New York, London, and Tokyo selected, and you can add any of 18 named zones spanning the Americas, Europe, and Asia-Pacific, each displaying its current UTC offset. That makes it easy to line up an event recorded on one server against the local time somewhere else. Enter a value above and pick the zones you need.

Software stores epoch time because a single integer is unambiguous, compact, and easy to compare. Since a Unix timestamp is measured in UTC and carries no timezone, two servers anywhere in the world agree on the same instant, which removes the parsing headaches and locale guesswork that come with text dates. Integers also sort and do arithmetic cleanly: finding records between two times, or checking whether a JWT exp claim has passed, is just a numeric comparison. Human-readable formats like ISO 8601 are better for display but heavier to parse and prone to timezone confusion. That is why APIs, log lines, and created_at columns lean on epoch values, then convert only when showing them to a person. This converter bridges both worlds — paste a raw timestamp above to instantly see ISO 8601, RFC 2822, and a plain-English relative time.

Because a Unix timestamp is just a count of seconds, you can shift it by adding or subtracting seconds: one day is 86400 seconds, one hour is 3600, and one minute is 60. Doing that math by hand is error-prone once months and leap years enter the picture, so this tool includes a date arithmetic panel that handles it for you. Start from any base timestamp or from the current moment, then add or subtract years, months, days, hours, minutes, and seconds, and it returns the resulting epoch value alongside the readable date and relative time. That answers questions like what epoch is 90 days from now or when a token issued today expires in two weeks. Open the arithmetic section above, enter your offset, and copy the calculated timestamp straight to your clipboard.