DEVELOPER · TIME

Unix timestamp converter

Convert explicit seconds or milliseconds to readable dates, or convert a local clock time in an IANA zone back to Unix time. No guessing between seconds and milliseconds.

Local only · IANA rules

Unix timestamp → date and time

Timestamp integer

Unit

IANA zone for display and reverse conversion

UTC / ISO 8601—

Selected IANA zone—

Browser local zone—

Local date and time → Unix timestamp

The IANA zone above is also the source zone for this conversion. DST gaps are rejected; repeated clock times let you choose the occurrence.

Local clock date and time

Unix seconds—

Unix milliseconds—

Limits & privacy

Seconds and milliseconds are always selected explicitly; the tool does not guess based on digit count.
Time-zone rules come from the browser / operating system IANA database.
No date, time, zone, or result is uploaded or written to persistent storage.