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Unix Timestamp Converter

Convert a Unix timestamp into a readable date and time, or convert a date and time into a Unix timestamp.

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How to use Unix Timestamp Converter

  1. 1Choose Timestamp to Date or Date to Timestamp depending on which value you already have.
  2. 2For timestamps, choose seconds, milliseconds or Auto-detect. For dates, choose whether the entered clock time should be interpreted as UTC or your browser's local timezone.
  3. 3Convert to see Unix seconds, Unix milliseconds, ISO UTC and your browser-local date together, then copy or share the result.

Useful tips

  • •Unix timestamps are measured from 1 January 1970 at 00:00:00 UTC. Negative timestamps represent dates before that instant.
  • •Many APIs use 10-digit Unix seconds, while JavaScript and some databases commonly use 13-digit milliseconds. Auto-detect is convenient, but manual unit selection is safer for unusual values.
  • •If you convert a local date around a daylight-saving clock change, some clock times may be ambiguous or may not exist. UTC avoids that ambiguity.

Frequently asked questions

What is a Unix timestamp?

A Unix timestamp is a number representing a specific moment in time. It counts how many seconds have passed since 1 January 1970 at 00:00:00 UTC. Websites, apps and APIs often use Unix timestamps to store dates and times in a standard format.

What is the difference between Unix seconds and milliseconds?

They represent the same instant with different units. Unix seconds count seconds from the epoch, while Unix milliseconds count thousandths of a second. Converting between them normally means multiplying or dividing by 1,000.

Why can the local date differ from the UTC date?

A Unix timestamp identifies one instant worldwide. The displayed local clock time depends on your browser timezone and daylight-saving rules, while UTC is the same everywhere.

Does Wid9et send my timestamps anywhere?

No. Timestamp and date conversion happens locally in your browser and does not require your values to be uploaded to Wid9et.