Unix timestamp converter
Current timestamp
Timestamp → date
Date → timestamp
About this tool
A Unix timestamp counts seconds (or milliseconds, microseconds, nanoseconds) since January 1, 1970 UTC. This tool turns a timestamp into a UTC ISO 8601 string, your local time, and a relative phrase like “3 hours ago.” It also works backward: type or pick a date and get the timestamp in seconds and milliseconds. It guesses the unit from the number of digits, so a 13-digit value from a JavaScript Date.now() call and a 10-digit one from a server log both work without any configuration.
Everything runs in your browser with the built-in Date and Intl APIs. No timestamp or date you type leaves your machine, which helps if you’re debugging a log entry or a session token you’d rather not paste into a random website.
Common uses: decoding a timestamp from an API response or a log line, checking when a JWT expires, converting a meeting time into your local zone, or filling in a datetime-local field on a form. See MDN’s guide to Date and time formats and RFC 3339 for the ISO 8601 profile used on the web.