Unix Timestamp Converter
Convert a Unix timestamp to a readable date — or a date to a timestamp — instantly, in seconds or milliseconds. See ISO 8601, UTC, local time and a live current epoch, all computed on your device.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert a timestamp
- 1
Enter a timestamp or a date
Type a Unix timestamp, or pick a date and time — each side updates the other instantly. Toggle between seconds and milliseconds.
- 2
Read every format
See the instant as ISO 8601 (UTC), a UTC string, your local time, the day of the week and a human “x hours ago”.
- 3
Grab the current time
The live current Unix time ticks at the top — hit “Use now” or copy it directly. Everything is computed on your device.
Why use Unix Timestamp Converter?
Two-way & live
Convert timestamp → date or date → timestamp, in seconds or milliseconds, with the current epoch always ticking.
UTC and local
ISO 8601 and UTC give you the absolute instant; local time and the date picker use your device’s timezone.
100% private
Everything runs locally in your browser with JavaScript. Your input is never uploaded, stored or seen by anyone — it even works offline once the page has loaded.
Works on any device
No install and no account. Runs in any modern browser on Windows, macOS, Linux, Android or iPhone.
Why developers store time as a number
A Unix timestamp is a single integer — seconds since 1 January 1970 UTC — with no timezone, no daylight-saving rules and no formatting ambiguity. That makes it trivial to store, index, sort and subtract: the difference between two timestamps is literally the number of seconds between two events. Databases, logs, JWTs and APIs all lean on it, which is why you keep running into numbers like 1700000000 that need translating back into a human date.
Seconds, milliseconds — and the year 2038
Classic Unix time counts seconds (10 digits today); JavaScript’s Date.now() and many APIs count milliseconds (13 digits). Paste either — the tool detects which by length, and the sec/ms toggle overrides it. The infamous “year 2038 problem” is when a signed 32-bit seconds counter overflows (19 January 2038); modern 64-bit systems and this converter are unaffected, but it’s a fun edge to test with the date picker.
Frequently asked questions
What is a Unix timestamp?
It’s the number of seconds (or milliseconds) since 1 January 1970 UTC, the “Unix epoch”. It’s a compact, timezone-free way to store an instant — 1700000000, for example, is 14 November 2023, 22:13:20 UTC.
Seconds or milliseconds?
Unix time is classically in seconds (a 10-digit number today); JavaScript and many APIs use milliseconds (13 digits). Use the sec/ms toggle — the tool also auto-detects by the number’s length when you paste.
Is my data uploaded to a server?
No. The tool runs entirely in your browser, so whatever you paste stays on your device. It’s safe for tokens, secrets and confidential data, and works offline once loaded.