Timestamp Converter

Translate between Unix seconds, milliseconds, ISO 8601 strings and calendar dates in your local or UTC time zone. See the relative time (“2 hours ago”) and round-trip precision instantly. Fully offline.

Runs 100% in your browserNo signup neededFree forever

Type a value and the tool auto-detects whether it is seconds, milliseconds, microseconds or an ISO date, then shows every representation plus relative time against a live-ticking 'now' readout.

Convert a timestamp

Try:

now1790172653 s= 1790172653453 ms= 2026-09-23T14:10:53.453Z

Conversions follow JavaScript's Date semantics and your device's locale. The “now” readout ticks live so you can observe the epoch in motion. All local.

Frequently asked questions

Is 1726994321 seconds or milliseconds?

By digit length: 10 digits are seconds, 13 are milliseconds, 16 are microseconds. This tool detects all three automatically.

Why do local and UTC times differ?

Your device's time zone shifts the wall-clock representation. The UTC readout is the ground truth that other systems share.

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