freesabaiUnix timestamp converter
Turn a Unix timestamp (epoch) into a readable date and back. Seconds, milliseconds, microseconds or nanoseconds: the tool guesses from the size of the number. Choose any time zone (daylight saving included), see ISO 8601, with the current time ticking. It runs in your browser.
This tool needs JavaScript. If you still see this after a few seconds, JavaScript is switched off in your browser or the page did not load completely: turn JavaScript on or reload the page.
- Now (Unix seconds)
- Now (milliseconds)
- Now (ISO 8601)
With no zone in the text, the time is taken in the zone chosen above (or end it with Z or +07:00).
How to use it
- Paste a timestamp in the first box (like
1700000000). The result appears at once. Or press "Use the current time". - Choose the time zone. Your device's zone is the default; type a name like
Asia/Bangkokor press UTC. - Or enter a date and time in the second box (like
2026-10-10 12:00:00) to get the timestamp in seconds and milliseconds.
Frequently asked questions
What is a Unix timestamp?
The number of seconds since 00:00:00 UTC on 1 January 1970 (the epoch). It does not depend on a time zone, so computers keep time as one number that is easy to compare and calculate with. JavaScript and Java use milliseconds; Unix, Python and PHP often use seconds.
How does the tool know whether the number is seconds or milliseconds?
By its size. Up to 11 digits is seconds (until the year 5138), up to 14 is milliseconds, up to 17 is microseconds, and more than that is nanoseconds. If it guesses wrong, choose the unit yourself.
Why is the time different from what I expected, by hours?
A timestamp is in UTC. Shown in Thai time you add 7 hours (Asia/Bangkok is UTC+7, with no daylight saving). Choose the zone you want. When you type a date yourself with no zone, it is taken in the zone you chose.
Good to know
- Zones and daylight saving rules come from the browser (the IANA database). In an old browser the rules may not be the newest.
- A time that does not exist because the clocks skip an hour when daylight saving starts is reported. A time that happens twice (when the clocks go back) uses the first one.
- A number beyond the browser's date range (the year ±275760) is reported as out of range.
Your data stays on your device
Everything runs in your browser. What you type, paste or open is not sent to freesabai's servers or anyone else's, and is not kept in the browser: close the page and it is gone. The site only counts how many times this page was opened and how many times someone copied or saved a result (never what was pasted or the result, and you can switch the counting off in the footer; see the privacy policy).
Report a problem or suggest an idea
Found a bug, or want this tool to do more? Tell us on the feedback page. No sign-up.
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