Unix timestamp converter
Convert Unix timestamps to human dates and back — seconds or milliseconds, with local time, UTC, ISO 8601 and relative time, plus a live epoch clock. Runs entirely in your browser.
Timestamp → Date
Enter a timestamp to convert.
Date → Timestamp
Pick a date and time to convert.
How it works
Paste a timestamp
Enter a Unix timestamp in seconds or milliseconds — the unit is auto-detected.
See every format
Get local time, UTC, ISO 8601, the weekday and a friendly relative time, all at once.
Or go the other way
Pick a date and time to get its epoch value in seconds and milliseconds. Copy any value.
About Unix time
Unix time— also called epoch time or POSIX time — counts the seconds since midnight UTC on 1 January 1970. Because it's a single number with no timezone, it's the standard way computers store and exchange moments in time: in databases, logs, JWTs, and API responses.
Humans, of course, prefer calendar dates. This converter bridges the two in both directions and shows the result across local time, UTC and ISO 8601 so there's never any ambiguity. Everything runs in your browser, so it's instant and private.
Frequently asked questions
What is a Unix timestamp?+
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. It's a simple, timezone-independent way to represent a moment in time.
Seconds or milliseconds — which is it?+
Unix timestamps are traditionally in seconds (10 digits today), but JavaScript and many APIs use milliseconds (13 digits). This converter auto-detects which you've pasted, and you can also force seconds or milliseconds.
Does it handle timezones?+
Yes. It shows the converted time in your local timezone, in UTC, and as an ISO 8601 string, plus a friendly relative time like '3 days ago'. Your detected timezone is shown above the clock.
Is my data private?+
Completely. The converter runs entirely in your browser — no timestamps or dates are ever sent to a server.
What is the year 2038 problem?+
Systems that store Unix time as a signed 32-bit integer overflow on 19 January 2038. Modern systems use 64-bit timestamps, which won't overflow for billions of years. This tool uses JavaScript's 64-bit dates.
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