— Encoders & generators

Unix Timestamp Converter

Turn epoch seconds or milliseconds into a readable date — and any date back into a Unix timestamp — with UTC, local and ISO output.

—Current Unix time (seconds)
—Current Unix time (milliseconds)

The current Unix time updates every second. Click a value above and copy it for a quick "now" timestamp.

— What it does

The Unix Timestamp Converter is a free tool that converts between Unix epoch time and human-readable dates. Paste a timestamp and it auto-detects seconds versus milliseconds, then shows the UTC time, your local time, the ISO 8601 string, and a relative description like "3 hours ago". Enter a date or ISO string and it returns the matching epoch in both seconds and milliseconds. Everything is computed locally with the browser Date API.

  • Auto-detects whether a timestamp is in seconds or milliseconds.
  • Shows UTC, local time, ISO 8601, and a human relative description.
  • Converts any date or ISO string back to epoch seconds and milliseconds.
  • Runs entirely in your browser — nothing you enter is uploaded.

How to use it

1

Choose a direction

Pick "Timestamp to date" to decode an epoch value, or "Date to timestamp" to encode a date.

2

Enter your value

Type a Unix timestamp (seconds or milliseconds), or a date / ISO 8601 string. Conversion happens as you type.

3

Copy the result

Read the UTC, local, ISO and relative output, or copy the epoch seconds and milliseconds you need.

Frequently asked

How does it know if my timestamp is in seconds or milliseconds?
It checks the magnitude of the number. Values with 13 or more digits are treated as milliseconds; shorter values are treated as seconds. You always see which interpretation was used.
What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. Many systems store time in milliseconds since that same instant.
Which date formats can I convert to a timestamp?
Anything the browser Date parser understands — ISO 8601 like 2026-06-15T12:00:00Z, common formats like 2026-06-15, and many locale strings. ISO 8601 is the most reliable across browsers.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser using the JavaScript Date API. Nothing you type is sent to a server or stored, so it is safe for private values.

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