What is a Unix timestamp?

It is the number of seconds elapsed since 1 January 1970 00:00:00 UTC (the Unix epoch). Negative values are dates before 1970.

How do I tell seconds from milliseconds?

Today a timestamp in seconds has 10 digits and one in milliseconds has 13. The tool picks the unit by magnitude, and you can override it.

Does the time zone affect a timestamp?

No. A timestamp identifies the same instant everywhere. The time zone only matters when displaying a date to a person or converting a date to a timestamp.

Is my data sent to a server?

No, everything is calculated in your browser.

Unix Timestamp Converter

Convert a Unix timestamp to a date and a date to a timestamp – all in your browser.

Current timestamp

Seconds

1791222772

Milliseconds

1791222772545

ISO 8601

2026-10-05T17:52:52.545Z

Timestamp to date

Timestamp

Date to timestamp

Date and time

Seconds

1791222771

Milliseconds

1791222771000

How to use it

The top box shows the current Unix timestamp in seconds and milliseconds, updating live; the Copy button copies the value.

Enter a number in the “Timestamp” field. The unit is detected automatically: up to 11 digits is seconds, 12–14 digits is milliseconds, more is microseconds. You can also pick the unit manually.
You get the date in UTC and in your local time, the ISO 8601 string and a relative time (for example “3 days ago”).
In “Date to timestamp”, pick a date and time and a time zone (local or UTC) to get seconds and milliseconds.

When it helps

A Unix timestamp is the number of seconds since 1 January 1970 00:00:00 UTC. It is used in databases, logs, API responses and JWT tokens because it does not depend on a time zone.

A common mistake is mixing up seconds and milliseconds: JavaScript’s Date.now() returns milliseconds, while many servers use seconds. Automatic detection helps you spot this quickly.

Privacy

All calculations run in your browser. Nothing you enter is sent anywhere.