This converter translates between Unix timestamps and calendar dates in both directions. It accepts seconds or milliseconds, shows ISO, UTC and local time, and keeps a live view of the current timestamp.
Your data is processed locally in your browser and is not uploaded to our server.
Enter a valid Unix timestamp.
Choose a valid local date and time.
Timestamps are absolute; local time depends on your device time zone. Dates before 1970 use negative values.
Date = 1 January 1970 UTC + timestamp × 1000 ms
A Unix timestamp counts seconds since 1970-01-01T00:00:00Z, ignoring leap seconds. Multiplying by 1000 gives the milliseconds used by JavaScript dates.
Seconds = floor(milliseconds ÷ 1000)
The date is converted to milliseconds since the epoch, then divided by 1000 for the seconds form. The milliseconds form keeps the full precision.
A log entry stores a timestamp in seconds.
The same instant is 14 November 2023 at 22:13:20 UTC. Your local clock may show a different hour.
A local date needs a timestamp for an API request.
The exact numbers depend on your time zone, because the input is interpreted as local time.
A seconds timestamp is about 1.7 billion today; the same instant in milliseconds is about 1.7 trillion. Choosing the wrong unit moves the date by decades, so check the unit before pasting.
The timestamp itself is absolute. The local display depends on your device time zone, while ISO and UTC are the same everywhere.
Negative timestamps represent dates before the Unix epoch. They are valid and are handled by the converter.
The number of seconds since 1 January 1970 at 00:00:00 UTC, not counting leap seconds. It is a timezone-independent instant.
Both are supported. JavaScript uses milliseconds, while many APIs and databases use seconds. Choose the matching unit before converting.
A timestamp is an absolute instant; local time adds your timezone offset. The ISO and UTC rows show the same instant without that offset.
The timestamp is unaffected by daylight saving. Local displays follow your device’s current timezone rules for that date.
Yes. The counter at the top refreshes every second while the page is open.