Best Free Unix Timestamp Converter
Convert Unix timestamps to dates and back — seconds or milliseconds, local or UTC.
100% free
No signup
No watermark
Files processed in memory, never stored
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How it works
- Paste a timestamp. Enter a Unix timestamp to see the date, or pick a date for the reverse.
- Convert. Get the human date (and ISO form), or the seconds + milliseconds.
- Adjust if needed. Use Advanced options for milliseconds input or UTC display.
About this tool
Turn a Unix epoch timestamp into a readable date, or a date into its timestamp — the conversion developers do constantly when reading logs, debugging APIs or setting expiry times. It shows the live current timestamp ticking, converts in both directions, and gives you the ISO 8601 form too. Advanced options handle millisecond timestamps (common in JavaScript) and switch between your local time and UTC so you’re never off by a timezone.
What people use it for
- Read a Unix timestamp from a log or API response
- Get the timestamp for a specific date/time
- Handle millisecond timestamps from JavaScript
- Check a time in UTC vs your local timezone
Frequently asked questions
The number of seconds since 1 January 1970 UTC (the “epoch”). It’s a compact, timezone-free way to store a moment in time, used throughout software.
Yes. Enable “Input is in milliseconds” in Advanced options for JavaScript-style timestamps (Date.now()), which are 1000× larger.
By default it shows your local time; toggle UTC in Advanced options. The ISO form is always shown so there’s no ambiguity.
No — all conversion happens in your browser using its built-in date handling.
It’s the live current timestamp, ticking once per second so you can grab the exact current epoch.
Yes, a client-side tool — no account, no limits, nothing to meter.
Yes. It runs in your browser, so Unix Timestamp Converter works on phones and tablets as well as desktop — there is no app to install.
Casual use is unlimited, under a generous fair-use cap that keeps it fast for everyone.
All modern browsers — Chrome, Safari, Firefox and Edge. Unix Timestamp Converter needs nothing installed beyond the browser you already use.