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Timestamp Converter

The Unix Timestamp Converter is a free online tool that turns epoch timestamps into readable dates and converts dates back into Unix time. It handles both 10-digit seconds and 13-digit milliseconds, shows UTC and local results side by side, and runs entirely in your browser.

Last updated · Free, no signup

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What is a Unix timestamp?

A Unix timestamp identifies an instant by counting elapsed time from 00:00:00 UTC on 1 January 1970. This converter turns epoch values into ISO, UTC, and browser-local dates and converts selected dates back into epoch time, making log fields and API values readable across time zones.

The page uses the native Date implementation and automatically distinguishes common 10-digit seconds from 13-digit milliseconds. Unix time itself has no time zone; local formatting is only a presentation. Negative values can represent dates before 1970, while ambiguous date strings should be replaced with an explicit ISO value and offset.