Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Enter a Unix timestamp (seconds or milliseconds).
Type a date (ISO 8601 works best).
Use on any page (bookmarklet)
Want Timestamp Converter without leaving the page you're on? Drag the button below to your bookmarks bar, then click it on any website to open Timestamp Converter right there — it runs entirely in your browser.
Use responsibly: a bookmarklet runs on whatever page you click it on. Avoid sensitive sites such as online banking, payment, or healthcare pages — you run it at your own risk. Everything is processed locally and no data is sent anywhere. See our Terms.
- Show your bookmarks bar if it's hidden — Ctrl+Shift+B (⌘+Shift+B on Mac).
- Drag the button above onto the bookmarks bar.
- Open any website and click the bookmark — the Timestamp Converter panel appears in the top-right corner. Use ✛ to move it between corners, or ›/‹ to tuck it against the edge and pull it back out.
- Click the bookmark again (or the ✕) to close it.
Note: a few sites with strict security policies may block bookmarklets.
Examples
Unix seconds → date
Input
1700000000
Output
2023-11-14T22:13:20.000Z (UTC)
Milliseconds auto-detected
Input
1700000000000
Output
2023-11-14T22:13:20.000Z (UTC)
Date → Unix timestamp
Input
2026-01-01T00:00:00Z
Output
1767225600 (seconds)
About this tool
This free online Unix timestamp converter turns epoch time into readable dates and back, right in your browser. Paste a timestamp to see it in ISO 8601, UTC, your local time, and as a relative time — or type a date to get the Unix seconds and milliseconds. Everything runs locally with no upload.
How to use
- Paste a Unix timestamp (seconds or milliseconds) into the first box.
- Click Now to drop in the current timestamp.
- Or type a date into the second box to get its timestamp.
Seconds vs. milliseconds
Unix timestamps are usually in seconds (10 digits today), but JavaScript and many APIs use milliseconds (13 digits). The converter detects which you pasted automatically, so you don't have to multiply or divide by 1000 yourself. A quick check: a current timestamp is 10 digits in seconds, 13 in milliseconds — if a converted date lands in 1970 or the far future, the unit is the usual reason.
Common uses
- Turn a timestamp in a log or database row into a readable date.
- Read the
iat/expclaims from a JWT. - Build a date filter for an API that expects epoch seconds.
- Sanity-check a value with the “3 days ago” relative time.
Remember the stored value is always UTC — the local time shown is just a display of the same instant. To compare a moment across cities see the time zone converter and the UTC offsets reference, and our guide to Unix timestamps covers the details.
Frequently asked questions
Is this timestamp converter free?
Yes — it's a completely free online Unix timestamp converter with no sign-up.
Is my data sent to a server?
No. Conversions run in your browser with no upload, using your device's own clock and time zone.
What is a Unix timestamp?
A Unix timestamp (epoch time) is the number of seconds since 1 January 1970 UTC. It's a simple, time-zone-free way to store a moment in time.
Does it support seconds and milliseconds?
Yes. The tool auto-detects the unit: values around 10 digits are treated as seconds and around 13 digits as milliseconds.
What time zone does it use?
It shows the moment in three forms — ISO 8601 and UTC (both time-zone independent) and your local time, based on your browser's time zone.
How do I convert a date to a Unix timestamp?
Type a date in the second box (ISO 8601 like 2026-06-23T14:30 works best) and it shows the matching Unix seconds and milliseconds.
What does the relative time mean?
It's how far the timestamp is from now — for example, "3 days ago" or "in 2 hours" — handy for sanity-checking a value.
Learn more
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