Convert Unix timestamps instantly.
Epoch to human-readable and back. Auto-detects seconds, milliseconds, and microseconds. Timezone-aware. Everything runs in your browser.
Runs locally. Nothing is sent anywhere.
Not a valid timestamp.
Could not parse that date string.
Time as a single number.
What Unix time is
Unix time counts seconds elapsed since January 1, 1970 at 00:00:00 UTC โ the Unix epoch. It's timezone-independent, unambiguous, and the universal language of timestamps in logs, APIs, and databases.
Seconds vs milliseconds
Most Unix timestamps are in seconds (10 digits). JavaScript and many APIs use milliseconds (13 digits). Some high-precision systems use microseconds (16 digits). This tool detects the precision automatically by magnitude.
Timezones and bugs
Unix time has no timezone โ it's always UTC underneath. The confusion happens when converting for display. Storing timestamps as epoch integers and converting to local time only at the UI layer eliminates an entire class of timezone bugs.