What is a Unix timestamp?

A Unix timestamp is the number of seconds that have elapsed since midnight UTC on 1 January 1970, known as the epoch. Many systems use milliseconds instead, which is the same value multiplied by 1000.

How do I tell whether a timestamp is in seconds or milliseconds?

A seconds-based timestamp for a recent date has about 10 digits, while a milliseconds-based one has about 13. This tool detects the magnitude automatically and converts accordingly, so you can paste either.

How do I convert a Unix timestamp to a readable date?

Paste the number into the input. The tool shows the corresponding local time and UTC time, along with a relative description like '3 hours ago', so you can read the moment at a glance.

What is the difference between Unix time and ISO 8601?

Unix time is a single integer counting seconds (or milliseconds) since the epoch. ISO 8601 is a human-readable text format like 2026-06-23T12:00:00Z. They represent the same instant; this tool converts between them in both directions.

Does the converter use my timezone?

Yes. It reads your browser's local timezone to display local time and also shows UTC for comparison. All conversion happens locally, so nothing is sent to a server.

Timestamp Converter

Convert Unix timestamps (seconds/ms), ISO 8601 strings, and human-readable dates. View local time, relative time, and next cron times. Enter a value below or click 'Now'.

Input

Enter Unix Timestamp (seconds or ms) or an ISO 8601 Date String.

Timestamp or ISO String

About Timestamp Converter

Time in software almost never looks like time. A database row stores 1719100800, a JWT carries an exp field full of digits, a log line stamps every event in milliseconds since 1970. None of that is human-readable, and the first step in debugging anything time-related is turning those numbers back into a date you can reason about.

This converter goes both ways. Paste a Unix timestamp — in seconds or milliseconds, it detects which — and see the local time, the UTC time, and how long ago (or how far in the future) that moment is. Or enter an ISO 8601 string or a plain date and get the timestamp back, ready to drop into code or a query. The relative view ("3 hours ago", "in 2 days") is often the fastest way to sanity-check whether an expiry or a scheduled job lines up with what you expected.

It runs entirely in the browser and reads your local timezone for display, so there's no round-trip to a server and no ambiguity about which clock the numbers refer to.

How to use Timestamp Converter

Enter a value
Paste a Unix timestamp in seconds or milliseconds, an ISO 8601 string, or a human-readable date. Click Now to start from the current moment.
Read the conversions
The tool shows the value as local time and as UTC at once, so you don't have to do timezone math in your head.
Check relative time
See how long ago or how far ahead the moment is — a quick way to confirm an expiry timestamp or scheduled event is where you expect.
Copy the result
Copy the timestamp or the formatted date back into your code, query, or test fixture.

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