A timestamp converter is a free online tool that translates unix timestamps (seconds or milliseconds since January 1, 1970) into human-readable dates and back again. It shows both UTC and your local time, converts dates to timestamps, and has a one-click button for the current moment.
How do I convert a unix timestamp to a date?
Paste the timestamp, choose Seconds or Milliseconds, and press Convert to date. You get the UTC time, your local time, the ISO 8601 string, and a relative description like "2 days ago", all at once.
Unix time counts seconds since January 1, 1970 00:00:00 UTC (the epoch). Ten-digit numbers are seconds; thirteen-digit numbers are milliseconds, the unit JavaScript Date uses. Picking the wrong unit gives a wildly wrong date, so the toggle matters.
How do I convert a date to a unix timestamp?
Pick a date and time in the lower box and press Convert to timestamp. The tool returns both the seconds and milliseconds forms, which you can paste straight into code, APIs, or database queries.
The datetime picker uses your local timezone, and the conversion accounts for it automatically. The "Use current time" button is handy for generating the now timestamp for tokens, cache-busting, or log correlation.
Frequently asked questions
Is this timestamp converter free?
Yes. Convert unlimited timestamps with no account and no limits. It runs entirely in your browser.
What is the difference between seconds and milliseconds?
Unix timestamps are traditionally seconds since the epoch (10 digits today). JavaScript Date uses milliseconds (13 digits). This tool converts either: just set the toggle to match your number.
Why does the date look wrong?
Almost always the unit toggle: a millisecond value read as seconds lands in the year 50,000+, and seconds read as milliseconds land in 1970. Flip the toggle and convert again.
What timezone are results shown in?
Both. Every conversion shows the UTC time and your browser local time, plus the ISO 8601 string, so there is no ambiguity.
Is my data uploaded anywhere?
No. All conversion happens locally in your browser. Nothing is sent to a server.