How Unix timestamps are defined
A Unix timestamp measures time since January 1, 1970 at 00:00:00 UTC. The tool automatically recognizes values in seconds and milliseconds.
Seconds and milliseconds
A typical ten-digit timestamp is treated as seconds. Larger values commonly produced by JavaScript Date are treated as milliseconds.
Local processing
Date conversion uses standard browser APIs and makes no network requests.
Frequently asked questions
Which time zone is used?
Results use ISO 8601 in UTC, so they do not depend on your device’s local time zone.
What does date-to-timestamp return?
The tool returns a whole number of seconds since the Unix epoch.