How do I tell seconds from milliseconds?

Second timestamps are usually 10 digits today. Millisecond timestamps are usually 13 digits. This tool auto-detects common lengths and also lets you choose the unit.

Does this converter use my timezone?

Yes. It shows both your local timezone and UTC so you can compare them quickly.

Unix Timestamp Converter - Epoch to Date and Back

Convert Unix timestamps and dates

A Unix timestamp counts seconds since 00:00:00 UTC on 1 January 1970. Developers use it in logs, APIs, databases, and JWT exp/iat claims. This converter shows both local time and UTC, and supports seconds or milliseconds.

How to use

Paste an epoch value and convert it to a local and UTC date.
Pick a date/time and convert it to seconds and milliseconds.
Use Use current time to anchor both sides to now.

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FAQ

What is a Unix timestamp?

It is the number of seconds since the Unix epoch: 1970-01-01T00:00:00Z.

Seconds or milliseconds?

10-digit values are usually seconds; 13-digit values are usually milliseconds. Auto-detect covers common cases.

Why show UTC and local time?

Logs and APIs often store UTC while people read local time. Showing both reduces off-by-timezone mistakes.