Free browser tool
Unix timestamp converter
Convert Unix seconds or milliseconds to UTC, or turn a UTC date and time into a timestamp.
How to use this tool
A Unix timestamp counts seconds or milliseconds since 1 January 1970 at 00:00:00 UTC. Select the unit explicitly; guessing from the number’s length can give the wrong date. For date-to-timestamp conversion, the chosen date and time are interpreted as UTC. Leap seconds are not represented separately by JavaScript dates.
Private by design
The calculation runs in your browser. There is no account requirement, input upload or subscription. Clear the fields when using a shared device.