Timestamp Converter

A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. It is a simple, timezone-independent way to represent a single moment in time, which is why it is used throughout programming, databases, log files and APIs. Some systems use milliseconds instead of seconds, giving a number that is 1000 times larger.

Paste the timestamp into the "Unix timestamp" box and the readable date appears instantly in your local time, in UTC, as an ISO 8601 string and as a relative time like "3 hours ago". The unit menu detects seconds or milliseconds automatically, but you can force a specific unit if your value is ambiguous. Each result has a copy button.

A timestamp in seconds is currently a 10-digit number (around 1.7 billion), while the same moment in milliseconds is a 13-digit number (around 1.7 trillion). This converter auto-detects the unit from the size of the number, and also supports microseconds and nanoseconds. If a value could be read either way, pick the exact unit from the menu to be sure.

Use the "Date and time → timestamp" section: pick a date and time and choose whether to read it as your local time or as UTC, and the matching Unix timestamp is shown in both seconds and milliseconds, plus an ISO 8601 string. Click "Now" to start from the current moment.

Yes. Every conversion runs entirely in your browser with JavaScript using your system clock and timezone — nothing is sent to or stored on any server, and the tool keeps working offline once the page has loaded.