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Unix Timestamp Converter

Convert a Unix epoch timestamp to a readable date, or a date to a timestamp — in seconds or milliseconds.

Runs in your browser. Nothing you type is sent to a server.

How to use Unix Timestamp Converter — Epoch to Date & Back, Free

  1. 1Paste a Unix timestamp in seconds, milliseconds or microseconds — the unit is detected automatically.
  2. 2Read the date in your local time, UTC and ISO 8601 form.
  3. 3Or pick a date and time on the right to get the timestamp back.

About Timestamp Converter

Unix time is the lingua franca of computer timekeeping: one number, counted in seconds from a fixed moment in 1970, with no timezone or calendar to argue about. Databases, log files, APIs and JWTs all use it, and it needs translating every time a human has to read it.

The most frequent source of confusion is the unit. JavaScript works in milliseconds, most other languages and Unix tools work in seconds, and mixing them gives you either 1970 or a date fifty thousand years from now. This converter detects the unit from the number of digits, so a pasted value resolves correctly whichever system it came from.

Results are shown in your local timezone, in UTC and in ISO 8601 at once. When comparing a timestamp with someone else, quote the UTC or ISO line — the local one depends on where each of you is sitting.

Frequently asked questions

What is a Unix timestamp?
The number of seconds elapsed since midnight UTC on 1 January 1970, known as the Unix epoch. It is timezone-free, which is why systems store time that way.
Seconds or milliseconds — how does it tell?
By length. Ten digits is seconds, thirteen is milliseconds, sixteen is microseconds. All three are detected automatically, which saves the usual off-by-1000 confusion.
Why does the date differ from my colleague's?
The local time row uses your device's timezone, so the same timestamp shows differently in different places. The UTC and ISO rows are identical everywhere — quote those when comparing.
What is the year 2038 problem?
Systems storing timestamps in a signed 32-bit integer overflow on 19 January 2038. Modern software uses 64-bit values, which last far longer than anyone needs.
Can timestamps be negative?
Yes — a negative value is a date before 1970, and this converter handles them.
Is it free?
Yes — unlimited use, no sign-up, no watermark and no limit on how many times you run it.