Seconds vs milliseconds?

Unix time is often in seconds; JavaScript Date.now() uses milliseconds. Pick the correct unit.

Timestamp

unix • iso • convert

Unix timestamp (seconds)

2026-06-13T11:56:23.000Z

ISO timestamp

1781351783

Convert between Unix epoch seconds/milliseconds and ISO 8601 dates. Essential when debugging logs, JWT exp claims, and database timestamps.

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1700000000 corresponds to a specific UTC instant readable as ISO 8601.

Seconds vs milliseconds?: Unix time is often in seconds; JavaScript Date.now() uses milliseconds. Pick the correct unit.

Convert epoch seconds, milliseconds, and ISO-8601 strings without timezone bugs.