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Convert Unix seconds or milliseconds to ISO dates, or turn local date-time values back into timestamps.
Convert Unix epoch seconds or milliseconds to an ISO timestamp, or turn a browser-local date and time into Unix seconds.
Convert Unix timestamps to readable date-times and turn selected date-times into seconds or milliseconds since the Unix epoch. Explicit UTC and local displays reduce time-zone ambiguity.
Input stays in the browser and is not sent to Fieldlet. Do not treat a formatting, encoding, test, or generated value as a substitute for security review.
Last reviewed for accuracy:
Scenario: The timestamp 0 seconds is entered.
Result: The UTC result is January 1, 1970 at 00:00:00 UTC.
Unix time measures elapsed seconds from that epoch; the selected display zone controls only the human-readable representation.
Fieldlet distinguishes second-based timestamps from millisecond-based browser timestamps. It creates a date instant, then formats that same instant in UTC and local time rather than shifting the underlying moment.
The timestamp itself represents an instant relative to UTC. A local date-time input is interpreted using the browser's local timezone before conversion.
The input was likely interpreted as seconds when it was milliseconds, or vice versa. Select the unit that matches the source system.
0 Unix milliseconds · UTC ISO date and time
Choose a local date and time.