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About EpochConverter

EpochConverter is a fast, clean Unix timestamp converter for developers. Convert between epoch timestamps and human-readable dates instantly — with timezone support, relative time display, and code snippets in 16 languages. Everything runs in your browser. Nothing leaves your machine.

What is a Unix Timestamp?

A Unix timestamp is a single integer representing the number of seconds elapsed since January 1, 1970, 00:00:00 UTC — a moment called the Unix epoch. It has no timezone, no locale, and no formatting. It's just a number.

That simplicity is the point. Storing 1708560000 in a database column is unambiguous across every server, every client, and every timezone. Comparing timestamps is a subtraction. Sorting them is trivial. Computing a duration is end - start.

The format is named after Unix — the operating system that popularized it in the early 1970s. Today it's a universal standard: every major programming language, database, and operating system supports it natively.

Seconds vs. Milliseconds

You'll see two variants in the wild:

  • •10-digit (seconds) — e.g. 1708560000. Used by Unix/Linux tools, Python's time.time(), databases like PostgreSQL and MySQL, JWT tokens, and most REST APIs.
  • •13-digit (milliseconds) — e.g. 1708560000000. Used by JavaScript's Date.now(), Java's System.currentTimeMillis(), and many browser/mobile APIs.

EpochConverter auto-detects which format you paste: 10 digits = seconds, 13 digits = milliseconds.

When Developers Use Epoch Timestamps

  • •Debugging API responses — a JSON payload comes back with "created_at": 1708560000 and you need to know if that was 3 minutes ago or 3 years ago.
  • •Checking JWT expiry — JWT tokens have an exp claim as a Unix timestamp. Decode it and paste the number here to see when it expires.
  • •Reading database records — PostgreSQL, MySQL, MongoDB, and SQLite all store timestamps internally as numbers. Paste the raw value to see the date.
  • •Analyzing log files — structured logs (JSON logs, syslog) often use epoch time. Use Date → Timestamp to find the exact window you want to grep for.
  • •Setting test fixtures — need a timestamp for "3 days from now" in a test? Use the Date → Timestamp section to get the exact number.
  • •Cross-timezone scheduling — store event times as Unix timestamps, then display them in each user's local timezone. The same number renders correctly everywhere.

How to Use This Tool

Live clock

The ticking number at the top is the current Unix timestamp in seconds. Click the copy icon to grab it. The millisecond version is shown below it.

Timestamp → Date

Paste any timestamp into the input. The tool auto-detects seconds vs. milliseconds. Select your timezone from the dropdown. You'll see the full date, time, ISO 8601 format, and relative time immediately.

Date → Timestamp

Pick a date and time using the inputs, or click "Now" to fill in the current moment. The tool shows the corresponding Unix timestamp in both seconds and milliseconds. Hit copy to use it in your code.

Code snippets

Need to do this in your own code? The homepage has one-liner examples in JavaScript, Python, Java, PHP, Go, Ruby, and Rust. For deeper examples — milliseconds, parsing, formatting, and framework-specific helpers — see the full language reference.

Why Another Timestamp Converter?

The most popular Unix timestamp tool has been around since 2004. It works, but it's cluttered, slow to load, and built for a web that no longer exists. The layout is table-heavy, the ads are intrusive, and it doesn't handle timezones well by default.

EpochConverter is what we wanted to exist: dark theme (developers live in dark UIs), monospace font for numbers, instant results without page reloads, and a clean single-column layout that works on phones. The live clock is always visible. Every output has a copy button. Nothing requires an account.

We kept it focused. No batch conversion, no microseconds, no date format customization. Just the 90% of things a developer actually needs when they paste a timestamp into a browser tab.

Technical Details

  • •All conversion happens entirely in your browser using JavaScript's built-in Date object and Intl.DateTimeFormat for timezone-aware display. No server requests, no third-party APIs.
  • •No cookies, no analytics trackers, no fingerprinting. We do show ads via Google AdSense to keep the lights on — they are clearly marked.
  • •Built with Next.js (App Router), TypeScript, and Tailwind CSS. Deployed on Vercel.
  • •Fully responsive — tested on iPhone, Android, tablet, and desktop. The tool works the same on all of them.
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