One instant, multiple representations
Unix seconds, Unix milliseconds and ISO 8601 can represent the same instant. Timestamp Studio keeps that instant stable while changing representation.
Timestamp Studio
AvailableConvert Unix timestamps and explicit ISO 8601 instants into UTC and IANA time-zone representations locally.
Runs locally. Your timestamp data never leaves this browser.
Browser-local conversion
Parsing and time-zone formatting happen entirely in this browser using Web Platform APIs. No conversion payload is sent to a Devary server.
Instant input
Enter Unix seconds, Unix milliseconds or ISO 8601 with Z or an explicit numeric UTC offset.
Auto detection accepts typical 10-digit seconds and 12+ digit milliseconds. Ambiguous 11-digit values require an explicit unit.
Interpretation boundary
Unix timestamps do not contain a time zone. A zone only changes how the same instant is displayed.
ISO input without Z or an explicit UTC offset is rejected in so the browser cannot silently choose a local-zone interpretation.
Browser time zone: UTC
Canonical outputs
Copy or hand off the representation you need. Changing the display zone never changes the instant.
Convert an instant to inspect its representations.
IANA time zones
Render an instant in UTC, your browser zone or a named IANA zone such as Europe/Madrid without changing the underlying moment.
No silent wall-clock guesses
A local date and time without a zone can be ambiguous or nonexistent around DST transitions. requires an explicit offset or Z for ISO input instead of guessing.