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Unix timestamp converter

Convert one value or paste a batch. Automatic unit detection handles common Unix timestamp lengths, and results show UTC and local time.

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Check a Unix timestamp's unit and time zone

A Unix timestamp counts time from 1970-01-01 at 00:00 UTC. This converter accepts integer seconds, milliseconds, microseconds and nanoseconds, and shows UTC alongside your browser's local time.

How to use it

  1. Paste the number, choose its known unit or keep automatic detection, then convert. Check the detected unit rather than relying on the number's length alone.
  2. For the reverse conversion, enter a date with an explicit zone, such as 2024-01-01T00:00:00Z, and convert it to numeric values.
  3. For multiple values, switch to batch mode and put one timestamp on each line. Each line uses automatic unit detection.

Example

Starting point
1704067200 with the seconds unit selected.
What to expect
2024-01-01T00:00:00.000Z in UTC, equivalent to 1704067200000 milliseconds. The local display depends on your time zone.

Before you start

  • Supported dates run from 1970 through 2100. Single timestamp input is limited to 128 characters; a batch to 1,000 non-empty lines and 65,536 UTF-8 bytes.
  • The date display has millisecond precision even when the exact nanosecond value is retained. Automatic unit detection is a heuristic; dates without a zone can be interpreted using the browser's local zone.