Which timezone is used?

The output shows both your browser's local time and UTC, plus the ISO 8601 representation.

What is the year 2038 problem?

Systems storing timestamps in a signed 32-bit integer overflow in January 2038. Use 64-bit integers to avoid it.

Timestamp Converter

Q: Seconds or milliseconds?

A ten-digit number is seconds; a thirteen-digit number is milliseconds. Use the unit selector to switch.

Convert Unix timestamps to dates and back, in seconds or ms.

Unix Timestamp → Date

Unix timestamp (seconds or milliseconds)

Enter a Unix timestamp to convert.

Date → Unix Timestamp

Date and time

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About Timestamp Converter

A Unix timestamp counts the seconds elapsed since 1 January 1970 UTC. It is unambiguous and timezone-free, which makes it the default way to store instants in logs, databases and JWT claims.

Confusion usually comes from units: JavaScript works in milliseconds while most backends use seconds. Ten-digit values are seconds, thirteen-digit values are milliseconds.