Timestamp Converter

Convert Unix seconds, Unix milliseconds, or date strings into ISO, UTC, and normalized Unix representations locally.

Published: Jul 23, 2026

Workbench

Runs in your browserno requests

JavaScript is required to run this local tool. Your input is not submitted anywhere.

Accepts

Unix seconds
Unix milliseconds
date string

Returns

ISO time
UTC time
Unix seconds

The converter makes seconds-versus-milliseconds handling explicit and reports invalid dates instead of silently normalizing them.

Filed under

Evidence register

1

Conversion uses the tested browser Date implementation without network access.
Site sourceFirst-partySource

External references

RepositorySite source