# Unix Timestamp Converter Convert between Unix/epoch timestamps and human dates — both directions, in seconds and milliseconds, local time and UTC. The live clock ticks in real time. Everything runs in your browser. ## Current time · live ## Timestamp → date ## Date → timestamp ## What a Unix timestamp is A **Unix timestamp** (a.k.a. epoch time) is the number of seconds that have elapsed since **00:00:00 UTC on 1 January 1970** — the "Unix epoch" — not counting leap seconds. It's timezone‑independent: the same instant is the same number everywhere on Earth, which is exactly why systems store and exchange time this way. ### Seconds vs milliseconds Unix time is classically counted in **seconds**. JavaScript, Java and many APIs instead use **milliseconds** (seconds × 1000). A quick tell: a seconds value for a recent date is ~10 digits; the millisecond version is ~13. The *Auto* mode here uses that digit count to guess the unit, but you can force it. ### Time zones & ISO 8601 An epoch value is an absolute instant; a *human* date only makes sense with a time zone. This tool shows both your **local** time and **UTC**. The ISO 8601 form (e.g. `2023‑11‑14T22:13:20.000Z`) is the unambiguous machine format — the trailing `Z` means UTC ("Zulu"). ### The Year 2038 note Systems that store the timestamp in a signed 32‑bit integer overflow on **19 January 2038**. Modern platforms (and this tool, via JavaScript's 64‑bit `Number`) use 64‑bit time, so the problem doesn't apply here. ### Privacy Every conversion happens locally with the browser's built‑in `Date` object. Nothing is sent anywhere. --- *Source: [ocxly.com/timestamp-converter.html](https://ocxly.com/timestamp-converter.html) — OCXLY, free 100% client-side privacy-first tools. Free two-way Unix timestamp converter: epoch to human date and back, in seconds and milliseconds, local time and UTC, with a live clock and ISO 8601 output. Runs entirely in your browser.*