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Unix Timestamp Converter

Paste an epoch from a log or JWT — or pick a date — and get ISO, UTC, local, and relative time instantly.

Convert Unix epoch ↔ human dates in your browser. Auto-detects seconds vs milliseconds — nothing is uploaded.

Live: 1790973848s·1790973848544 ms

Reading as seconds (auto-detected)

ISO 8601

2024-03-28T16:00:00.000Z

UTC

Thu, Mar 28, 2024, 4:00:00 PM UTC

Local

Thu, Mar 28, 2024, 4:00:00 PM UTC

UTC

In selected zone

Thu, Mar 28, 2024, 4:00:00 PM UTC

UTC

Relative

3 years ago

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How to use this tool

  1. Choose Epoch → Date or Date → Epoch. Use Now for the current instant.
  2. Paste a timestamp (Auto detects seconds vs ms) or enter a date/time in the selected timezone.
  3. Copy ISO, UTC, local, relative, or the epoch in s / ms / µs / ns.

Read epoch numbers without the s vs ms trap

The classic bug: treating JavaScript milliseconds as seconds (or the reverse) and landing in 1970 or the year 50,000. This tool auto-detects the unit, shows ISO 8601 and relative time, and keeps conversion in your tab.

Need several cities at once for a meeting? Use the Time Zone Converter. Previewing a crontab or CronJob? Try the Cron Explainer. Decoding a token exp claim? Open the JWT Decoder.

FAQ

What is a Unix timestamp?

The number of seconds (or milliseconds) since 1970-01-01 00:00:00 UTC — also called epoch time. Logs, databases, APIs, and JWTs use it constantly.

Seconds or milliseconds — which do I have?

Leave Unit on Auto-detect. About 10 digits is usually seconds; about 13 digits is milliseconds (like JavaScript Date.now()). You can force a unit if Auto is wrong.

Is the conversion done on a server?

No. Everything runs in your browser with the built-in Date and Intl APIs.

How does the timezone picker work?

Epoch values are absolute instants. The picker only changes how that instant is displayed (and, in Date → Epoch, which wall-clock timezone you mean).

Why did Date → Epoch say the time does not exist?

Some local times are skipped when clocks spring forward for DST. Pick a different minute in that timezone.