Unix Timestamp Converter — Free Online
Convert Unix timestamps to readable dates and back. Live epoch clock, timezone aware, runs fully in your browser.
How it works
Unix time counts the seconds (or milliseconds) since 1 January 1970 UTC. It is everywhere in logs, APIs and databases, and it is impossible to read at a glance. This converts it both ways and shows the current epoch time updating live.
Timezone handling is where most converters quietly lie to you. This one shows your local time and UTC side by side, and lets you read an incoming timestamp as either seconds or milliseconds.
How to use it
- Read the current epoch time at the top, updating every second.
- Paste a timestamp in the left box to convert it to a date.
- Or pick a date and time on the right to get its timestamp.
- Toggle seconds / milliseconds if the result looks wrong by a factor of 1000.
Why this runs in your browser
Every tool on this site runs 100% in your browser. Your files are never uploaded to any server. That means no upload wait, no third party holding a copy of your data, and it keeps working even if your connection drops.
Frequently asked questions
Seconds or milliseconds?
Classic Unix timestamps are seconds. JavaScript and many modern APIs use milliseconds. If your converted date lands in 1970, you probably have seconds being read as milliseconds — flip the toggle.
Why is the converted time different from what I expected?
Almost always a timezone issue. The same instant is a different wall-clock time in different places. Check the UTC row to confirm the absolute time is right.
What happens after 2038?
Systems storing Unix time as a signed 32-bit integer overflow on 19 January 2038. This tool uses 64-bit floating point, so it handles dates well past that without any problem.
Does it account for leap seconds?
No. Unix time ignores leap seconds entirely, which is standard behaviour and what nearly all software expects.
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