FREE TOOL

Unix Timestamp Converter

Convert Unix timestamps to readable dates or turn local dates into seconds and milliseconds.

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About Unix Timestamp Converter

Convert Unix timestamps into readable UTC and local dates, or create Unix time from a local date. Seconds and milliseconds are detected automatically and both values are shown together.

How to use

1.Choose timestamp to date or date to timestamp.
2.Enter a Unix timestamp or local date and time.
3.Review and copy UTC, local time, seconds, or milliseconds.

Useful for

Reading timestamps in API responses and logs
Creating epoch values for databases
Checking whether a timestamp uses seconds or milliseconds

Verified examples and scope

These examples describe reproducible behavior in this tool. They are not a guarantee for inputs outside the documented scope.

Input or setting	Expected result	Condition
0	1970-01-01T00:00:00.000Z, 0 seconds, and 0 milliseconds	The page also displays the device-local date and time.
100000000000	Detected as milliseconds	Absolute values at or above 100,000,000,000 use milliseconds; smaller values use seconds.

Known limitations

Date input is interpreted in the browser device’s local time zone.
Dates outside JavaScript Date range and distinct leap-second representations are unsupported.

If the result is unexpected

If automatic unit detection is unexpected, check the input digits and the displayed detected unit.

How it works

The absolute numeric value selects seconds or milliseconds, then JavaScript Date performs the date conversion.

Dates and timestamps are converted in the browser.

Input examples

1704067200 seconds → 2024-01-01T00:00:00.000Z
1704067200000 milliseconds → the same date

Notes and limitations

Date input is interpreted in your device’s local time zone.
Seconds and milliseconds are detected automatically from the magnitude of the number.

Frequently asked questions

What is Unix time?

Unix time is a numeric count of time elapsed since January 1, 1970 at 00:00:00 UTC, commonly represented in seconds or milliseconds.

How are seconds and milliseconds detected?

The tool uses the magnitude of the input to detect the likely unit and displays the detected unit with the result.

Which time zone is used for date input?

Date input is interpreted in the local time zone configured in your browser or device. UTC is also displayed in the result.

Does Unix time include leap seconds?

Unix time normally does not count leap seconds separately. This tool follows the standard date behavior of your browser.