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Unix Timestamp Converter

Convert Unix timestamps in seconds or milliseconds to a readable UTC date and back again.

My tools →

UTC date and time

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Unix timestamp (seconds)

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Unix timestamp (milliseconds)

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Date and time results follow the Gregorian calendar and standard time-zone data. Working-day counts exclude weekends but do not automatically remove public holidays. Check local rules and daylight-saving transitions when timing is critical.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Unix Timestamp Converter

  1. 1 Enter the date, time or values you want to calculate.
  2. 2 Review the result and the assumptions shown with the calculator.

How this calculator works

Unix time counts elapsed seconds from 1 January 1970 at 00:00:00 UTC. Millisecond timestamps are converted to seconds before formatting.

Assumptions and limitations

The result is shown in UTC and excludes leap seconds, as standard Unix timestamps do. This calculator accepts non-negative timestamps through year 9999.

Frequently asked questions

How is the result calculated?

Unix time counts elapsed seconds from 1 January 1970 at 00:00:00 UTC. Millisecond timestamps are converted to seconds before formatting.

What should I keep in mind?

The result is shown in UTC and excludes leap seconds, as standard Unix timestamps do. This calculator accepts non-negative timestamps through year 9999.

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