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Timestamp Converter

Convert Unix timestamps to human dates and vice versa.

Timestamp Converter — Free Online Unix Epoch to Date & Time Converter

UtilityBox's free timestamp converter is the fastest way to convert Unix timestamps to human-readable dates and convert any date back to a Unix epoch. Whether you're debugging API responses, analysing log files, working with database records, or checking when a JWT token expires, this tool gives you instant results in UTC, local time, ISO 8601, and relative format. A live Unix clock at the top shows the current epoch time in both seconds and milliseconds, ticking in real time. No page reload, no sign-up, and no data leaves your browser.

How to Use the Timestamp Converter

  1. The Live Clock at the top shows the current Unix time in seconds and milliseconds, updating every second.
  2. To convert a Unix timestamp to a date: enter the timestamp in the left panel, choose seconds or milliseconds from the dropdown, and click Convert.
  3. The result shows the date in UTC, your local timezone, ISO 8601 format, and a relative time (e.g., "3 years ago").
  4. To convert a date to Unix: use the date-time picker in the right panel, select local or UTC interpretation, and click Convert.
  5. Click the ⎘ copy button beside any result to copy it to the clipboard instantly.

Key Features

  • Live UTC clock — shows current Unix seconds, milliseconds, and UTC date/time ticking in real time.
  • Convert Unix → Date: supports both seconds and milliseconds input; shows UTC, local, ISO 8601, and relative time.
  • Convert Date → Unix: date-time picker with local or UTC mode; returns seconds, milliseconds, and hex.
  • Copy buttons on every result — click ⎘ to copy any value to the clipboard with one click.
  • Shows relative time — "3 days ago", "in 2 hours" — great for log analysis and expiry checks.
  • Hex output — shows the Unix timestamp in hexadecimal, useful for debugging packed binary formats.
  • Runs entirely in the browser — no server calls, works offline, completely private.
  • Completely free with no sign-up required.

Common Use Cases

  • Debugging APIs and backend responses: Developers use this unix timestamp converter to decode the epoch values returned by REST APIs, webhooks, and JSON payloads. Paste a raw timestamp such as 1721520000 and instantly see the human date in UTC and your local time. It also handles millisecond timestamps from JavaScript's Date.now(), so you never have to guess whether a value is in seconds or milliseconds.
  • Reading and correlating log files: Server logs, database records, and monitoring tools often store event times as Unix epoch. This epoch converter turns those numbers into readable dates plus a relative time like "3 hours ago", making it easy to line up events across systems. Convert unix to date in one direction and date back to epoch in the other to cross-check the exact moment something happened.
  • Checking token and session expiry: JWTs, OAuth tokens, cookies, and cache entries record their expiry as an epoch time. Drop the exp value into the timestamp converter to see precisely when a token expires in your local timezone and how long from now that is. This makes it quick to confirm whether an authentication failure was caused by an expired credential.
  • Scheduling and data migration work: When building cron jobs, scheduling tasks, or migrating records between databases, you frequently need to convert a specific date to a Unix timestamp. Use the date-to-Unix picker to generate the exact seconds or milliseconds value for a chosen moment, choosing local or UTC interpretation, and copy it straight into your config, script, or SQL query.

Frequently Asked Questions

What is a Unix timestamp?

A Unix timestamp (also called epoch time or Unix time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. It is a compact, timezone-independent way to represent a single moment in time, which is why databases, APIs, and log files store dates this way. This unix timestamp converter turns that raw number back into a readable date and time.

Does it support milliseconds?

Yes. This epoch converter handles both seconds and milliseconds. When converting a Unix timestamp to a date, choose seconds or milliseconds from the dropdown so the value is interpreted correctly — a JavaScript Date.now() value in milliseconds and a standard 10-digit epoch in seconds will both convert accurately. When converting a date to Unix, the result is shown in both seconds and milliseconds.

How do I convert epoch to a human date?

Enter the epoch value into the left panel, select whether it is in seconds or milliseconds, and click Convert. The timestamp converter immediately shows the corresponding date in UTC, your local timezone, ISO 8601 format, and a friendly relative time such as "2 days ago". You can then click the copy button beside any of those results to copy the human-readable date to your clipboard.

Does it show UTC and local time?

Yes. Every conversion displays the result in both Coordinated Universal Time (UTC) and your browser's local timezone, alongside the ISO 8601 string and a relative time. This is especially useful when converting unix to date for logs recorded on servers in a different timezone, because you can read both the canonical UTC value and what it means where you are.

Is it free?

Yes, the UtilityBox timestamp converter is 100% free. There is no sign-up, no account, no download, and no paywall. Every feature — the live Unix clock, seconds and milliseconds support, UTC and local output, hex output, relative time, and copy buttons — is available to everyone at no cost.

Does it work offline?

Yes. All conversions run entirely in your browser using JavaScript, with no server calls. Once the page has loaded, this epoch time converter continues to work without an internet connection, and none of the timestamps or dates you enter ever leave your device, keeping your data completely private.

Can I use it on mobile?

Yes. The timestamp converter is fully responsive and works on smartphones and tablets. The live clock, the Unix-to-date panel, and the date-to-Unix picker all adapt to smaller screens, and the copy buttons work with mobile clipboards. No app download is required — just open the page in any mobile browser such as Chrome, Safari, or Firefox.