Unix Timestamp Converter

Epoch ↔ date.

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Private by design: This tool runs in your browser — your data is not uploaded.

How to use Unix Timestamp Converter

1609459200 Unix seconds = 2021-01-01T00:00:00.000Z — convert epoch seconds, milliseconds, or ISO strings both ways.

Step-by-step

  1. Enter a Unix timestamp, milliseconds, or ISO date.
  2. See seconds, ms, and ISO formats synced.
  3. Copy the format you need.

Common questions

Seconds or milliseconds?
Values above 1e12 are treated as milliseconds; otherwise seconds.
What timezone is ISO in?
ISO output uses UTC (Z suffix).

Last updated: 2026-06-05