Unix time (epoch) counts seconds since 1970‑01‑01 00:00:00 UTC, not including leap seconds.

How do milliseconds fit in?

Some systems use milliseconds. Toggle the ms/seconds switch to convert precisely.

Can I share a specific timestamp?

Yes — use Share to copy a URL with the timestamp and units embedded.

Convert epoch ↔ date, view multiple time zones and relative time, and copy/share results.

Epoch Milliseconds Date & time (local) Actions

Add/Subtract (seconds)

Relative —

ISO 8601 (UTC) —

Zone	Time

How do I convert human date to epoch?

Pick a date/time in the Local field. The Epoch field updates automatically.

How do I apply an offset?

Enter seconds in Add/Subtract and press Now or edit Epoch — the display updates with the delta applied.

Which time zones are shown?

UTC, Eastern, Central, Mountain, Pacific, London, and Tokyo. The list can be extended in code.