Free Unix Timestamp Converter — Epoch to Date, 2 Ways

Unix Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and back. Runs entirely in your browser — nothing is sent anywhere.

Current Timestamp
Seconds —
Milliseconds —
ISO 8601 —
Timestamp → Date

Detected unit: —

ISO 8601
UTC
Local Time
Relative
Date → Timestamp
Unix Seconds
Unix Milliseconds
Copied!

Built by VahaC — 100% client-side, no data sent anywhere.

If you’ve ever stared at a raw number like 1717000000 in a log line or an API response and had no idea what date it actually meant, this unix timestamp converter is for you. Paste a Unix timestamp in seconds or milliseconds and get an instant ISO 8601, UTC, and local-time breakdown — or go the other way and turn any date back into an epoch value. Everything runs in your browser, so nothing you paste ever leaves your machine.

What This Unix Timestamp Converter Does

  • 🔍 Auto-detects whether a pasted number is seconds or milliseconds, so this unix timestamp converter always shows the right unit without you having to remember which one an API or log line used
  • 🕒 Converts any Unix timestamp to ISO 8601, UTC, and your local time zone, all at once
  • 💬 Shows a plain-English relative time next to every result — “3 hours ago” or “in 2 days”
  • 🔄 Converts a date and time back into Unix seconds and milliseconds, with an optional “Treat as UTC” toggle
  • ⏱ A live-ticking “Current Timestamp” panel shows the current epoch in both units plus ISO 8601, refreshed every quarter second
  • 📋 One-click copy buttons on every output field, no manual text selection required

How to Use It

Whether you’re staring at a raw epoch value in a log file or wiring up an API integration, this unix timestamp converter gets you a readable date in one paste:

  1. Paste a Unix timestamp — seconds or milliseconds — into the Timestamp → Date field.
  2. Let the tool auto-detect the unit, or force it with the Unit dropdown if you already know which one you have.
  3. Read off the ISO 8601, UTC, local time, and relative time results instantly, no button click needed.
  4. To go the other direction, pick a date and time in the Date → Timestamp panel.
  5. Check “Treat as UTC” if the date you entered should be interpreted as UTC instead of your local time zone.
  6. Copy any value with the 📋 button next to it.

Why Auto-Detection Isn’t Always Perfect

This unix timestamp converter guesses seconds vs. milliseconds by counting digits: current-era second timestamps are around 10 digits, current-era millisecond timestamps are around 13. Anything with 12 or more digits gets treated as milliseconds. That heuristic is right almost all the time, but it can get confused on far-future or far-past dates, where a seconds value could theoretically grow long enough to look like milliseconds. If a result looks off by a factor of 1,000, switch the Unit dropdown from Auto-detect to Seconds or Milliseconds manually and the conversion updates immediately.

Practical Use Cases

Here’s where a unix timestamp converter earns its keep in a typical homelab or dev workflow:

  • 🪵 Reading log timestamps — turn a raw epoch value from an Nginx, Traefik, or application log into a readable date without spinning up a script.
  • 🔌 Debugging APIs — many REST APIs return created_at or expires_at as a Unix timestamp; paste it straight into this unix timestamp converter to see what it means.
  • ⏲ Setting cache and token expiry — convert a human-friendly date into the epoch value your Redis TTL, JWT exp claim, or cron job config expects.
  • 🗓 Cross-referencing with cron schedules — pair it with the Cron Expression Generator Parser to check an epoch value against the exact time a scheduled job actually fires.
  • 📊 Correlating alerts across time zones — check what a UTC timestamp in a monitoring alert maps to in your own local time, the same way you’d reason about downtime with the SLA Uptime Downtime Calculator.

Privacy, Ads, and Data Policy

  • ✅ 100% free — no registration, no account, no paywall.
  • ✅ No data storage — every timestamp and date you enter stays in your browser tab and is never sent to a server.
  • ✅ No ads in results — no watermarks, no tracking pixels, no upsells.
  • ✅ Client-side only — no external API calls, no CDN dependency for this tool.

Open Source and Self-Hosting

This unix timestamp converter is part of the open-source vahac-tools repository on GitHub — a single-folder, dependency-free build you’re welcome to fork, self-host, or adapt. Browse the rest of the collection on the Tools page, including the JSON Formatter and Validator for cleaning up the API responses these timestamps usually come from.

Built by VahaC — 100% client-side, no data sent anywhere.