Last updated: October 2026
Unix timestamp converter online free — epoch to date in one click
Short answer: paste a timestamp above, pick seconds, milliseconds or microseconds, and click Convert to date — you get the date in local time, UTC, ISO 8601 and relative form. The reverse direction works too. No signup, nothing leaves your browser.
Seconds, milliseconds or microseconds?
A Unix timestamp counts time since 1 January 1970. Seconds is the classic 10-digit format you'll see in APIs and databases (e.g. 1700000000). Milliseconds is the 13-digit format JavaScript's Date.now() returns — if your timestamp has 13 digits, pick this. Microseconds is the 16-digit format some databases and high-precision systems use. A quick rule: 10 digits = seconds, 13 = milliseconds, 16 = microseconds.
Timezones, handled
The Local row shows the date in your browser's timezone — handy for reading logs. The UTC and ISO 8601 rows are timezone-independent, so use those when pasting timestamps into tickets, docs or code that teammates in other timezones will read.
Frequently asked questions
How do I convert a Unix timestamp to a date?
Paste the timestamp into the box above, pick seconds, milliseconds or microseconds, and click Convert to date. You'll see the date in your local timezone, UTC, ISO 8601 format and as relative time like "3 hours ago".
How do I convert a date to a Unix timestamp?
Pick a date and time in the second box and click Convert to timestamp. You get the epoch value in seconds, milliseconds or microseconds depending on the unit you selected.
What's the difference between seconds, milliseconds and microseconds?
A Unix timestamp counts time since 1 January 1970. Seconds is the classic 10-digit format (e.g. 1700000000). Milliseconds is the 13-digit format JavaScript's Date.now() returns. Microseconds is 16 digits, used by some databases and high-precision systems.
What timezone does the converter use?
The "Local" row shows the date in your browser's timezone. The UTC and ISO rows are timezone-independent, so use those when sharing timestamps across timezones.
Is my data private?
Completely. Conversion runs entirely in your browser — nothing is uploaded, stored or tracked.