01
Choose a direction
Convert a Unix timestamp to a date or a timezone-explicit ISO date to Unix time.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to readable dates and timezone-explicit ISO dates back to timestamps.
UTC / ISO 8601
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Your local time
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Unix seconds
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Unix milliseconds
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Unix timestamps represent an instant relative to 1970-01-01T00:00:00Z. Conversion runs locally; Got A Tool does not receive the value.
Your data is processed locally in your browser whenever supported and is not uploaded to our servers.
How it works
Convert Unix time in three steps
02
Set the unit
When reading a timestamp, specify seconds or milliseconds instead of relying on magnitude guesses.
03
Review every format
See UTC ISO, local display, Unix seconds, and Unix milliseconds for the same instant.
No hidden timezone guesses
One instant, shown in useful formats.
Unix time is anchored to UTC. Date input must include Z or a numeric offset, preventing the same text from silently producing different timestamps on different devices.
Seconds and milliseconds
Select the source unit explicitly, including fractional seconds with millisecond precision.
Timezone-explicit input
Accepts ISO 8601 date-time text with Z or an offset such as +03:00 or -05:00.
UTC and local output
Shows the canonical UTC instant and a separate display formatted in the current device timezone.
Local processing
Dates and timestamps are converted in the browser without being uploaded or stored.
FAQ
Common questions
What is a Unix timestamp?
It represents an instant as elapsed time from 1970-01-01T00:00:00Z. Many systems use whole seconds, while JavaScript commonly uses milliseconds.
How do I know whether my timestamp uses seconds or milliseconds?
Check the system that produced it and choose the matching unit. The tool does not guess from digit count because that can silently misinterpret valid historical or future values.
Why must date input include a timezone?
A date-time without a timezone is ambiguous. Requiring Z or an explicit offset makes the resulting Unix timestamp deterministic across devices and locations.
Can it handle dates before 1970?
Yes. Instants before the Unix epoch use negative timestamps, within the date range supported by the browser.
Is the displayed local time uploaded?
No. The browser formats the instant using your device settings. Got A Tool does not receive the timestamp, date, or timezone.
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