Timestamp (Unix) Converter
What is a Unix timestamp?
Result
How it is calculated
A Unix timestamp counts the seconds elapsed since 1970-01-01 00:00:00 UTC. If you enter only digits, the tool reads them as seconds and formats that moment in UTC: date and time, ISO 8601 form and weekday. If you enter anything else, such as a date string, it is parsed as a date and turned into a timestamp. Text it cannot parse produces an invalid message. All output is in UTC, with no local time zone or daylight saving applied, and the tool uses seconds, not milliseconds. A 13-digit millisecond value will therefore land far in the future.
Worked example
Enter 1700000000. The tool treats it as 1,700,000,000 seconds after 1970-01-01 00:00:00 UTC. That is 19,675 whole days plus 22 hours 13 minutes 20 seconds. The Unix value stays 1700000000, the UTC time is 2023-11-14 22:13:20 UTC, the ISO form is 2023-11-14T22:13:20+00:00, and the weekday is Tuesday.
Common mistakes
- Pasting a 13-digit millisecond timestamp from JavaScript. Divide it by 1000 first.
- Reading the UTC output as local time. Your own zone may differ by several hours, which can even change the date.
- Entering a date string without a time zone and assuming it is local. Check what the parser produced.
- Expecting negative or fractional timestamps to be handled as digits; only plain digits are read as seconds.
About this calculator
This converter moves between a Unix timestamp — the number of seconds elapsed since midnight UTC on January 1, 1970, the "epoch" — and a human-readable date, in both directions, showing the result in both UTC and ISO 8601 format. Computers store and compare dates internally as this single incrementing number precisely because it avoids time zone and calendar ambiguity; the readable date you see is just a display conversion applied to it.
Developers use it constantly when debugging APIs, log files or database records that store dates as raw timestamps, since a value like 1755561600 is meaningless to read at a glance but instantly clear once converted. It's also used to construct a specific timestamp for testing, to check when a token or session expires, or to translate a timestamp from one system's log into the local date and time it actually corresponds to.
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