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Unix timestamp converter — offline

Epoch to date, date to epoch — with UTC, local time, and relative time at a glance.

100% private — files never leave your device
Current Unix time:…

How it works

  1. 1

    Paste a Unix timestamp (s or ms) or an ISO date.

  2. 2

    The interpretation is shown explicitly — no guessing.

  3. 3

    Copy any representation with one click.

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Frequently asked questions

Does this tool send my timestamps anywhere?

No — conversion is plain date math running in your browser. Nothing about what you convert is recorded anywhere.

Seconds or milliseconds — how does it know?

Numbers of 13+ digits are treated as milliseconds, shorter ones as seconds — the interpretation is always shown so there are no surprises.

What formats can I paste?

Unix timestamps (seconds or milliseconds) and anything JavaScript can parse as a date, like ISO 8601 (2026-07-19T12:00:00Z).