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Unix timestamp converter

Convert seconds and milliseconds to UTC, and convert an ISO time with an explicit offset back to Unix time.

Get started

  1. Use the example values or enter your own measurements.
  2. Calculate, then copy the result or download the available details.

Example

Input

0 seconds

Expected result

1970-01-01T00:00:00.000Z

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

Unix time is elapsed time since 1970-01-01T00:00:00Z. Conversions support dates from 1900 to 9999 at millisecond precision.

Calculation mode

Timestamp to date
  • Unix timestamp
  • Unit · Seconds / Milliseconds
Date to timestamp
  • ISO 8601 with offset