Timestamp Converter

A Unix timestamp is the number of seconds that have passed since 1 January 1970 at midnight UTC, a fixed reference point called the Unix epoch. Computers often store dates this way internally because a single number is easier to compare, sort, and do math with than a formatted date string. Some systems use milliseconds instead of seconds for extra precision, which is why timestamps can look very different in length depending on where they came from.

Developers reading log files or API responses that store dates as raw numbers, support staff investigating when an event happened from a database record, and anyone turning a timestamp from a webhook, spreadsheet, or bug report into a readable date.

Numbers below 10,000,000,000 are treated as seconds. Larger numbers are treated as milliseconds, since a millisecond count for a modern date is a much bigger number.

Local output uses your browser's timezone setting. The ISO and UTC outputs are timezone-neutral, so they stay the same no matter where you're located.

Date strings without timezone information can be interpreted by your browser as local time instead of UTC, which shifts the resulting timestamp by your UTC offset. Include an explicit timezone in the input to avoid this.

No. Date conversion runs locally in your browser.

For any timestamp or date you enter, it displays seconds, milliseconds, ISO, local time, and UTC side by side, so you can copy whichever format the system you're working with expects.