DataHub Tools Unix Timestamp Converter

Unix Timestamp Converter

Local-first

Convert Unix timestamps in seconds or milliseconds to readable local and UTC dates in your browser.

What is Unix Timestamp Converter?

Convert Unix timestamps in seconds or milliseconds to readable local and UTC dates in your browser.

  • Convert timestamps to readable dates
  • Generate Unix timestamps from date input
  • Compare local time and UTC output

How to use it

  1. Paste an integer timestamp or a date string.
  2. Confirm whether the source value is in seconds or milliseconds.
  3. Compare the UTC result with the displayed browser-local time.
  4. Copy the seconds or milliseconds form required by the receiving system.

Quick example

Example input

1710000000

Expected output

Unix seconds: 1710000000
Unix milliseconds: 1710000000000
UTC: 2024-03-09T16:00:00.000Z

Ten-digit values are normally seconds; thirteen-digit values are normally milliseconds. Always confirm the source convention.

Best use cases

  • Convert log, API, and database timestamps.
  • Compare UTC with the browser's local time zone.
  • Generate the current Unix timestamp for testing.

Reference standards and behavior

JavaScript Date stores milliseconds since the Unix epoch. This tool treats smaller integer values as seconds and larger values as milliseconds, then displays UTC and browser-local time.

Sources checked July 24, 2026. Standards can change; review the source pages before formal integration.

Notes

  • A Unix timestamp represents an instant and does not contain a time-zone label.
  • Date-string parsing can vary when an offset is omitted.
  • The page uses JavaScript Date and displays both seconds and milliseconds.

FAQ

How are seconds and milliseconds detected?

Integers with an absolute value below 100,000,000,000 are treated as seconds; larger values are treated as milliseconds.

Does a Unix timestamp include a time zone?

No. It identifies an instant; UTC and local time are display formats for that same instant.

Why can a date string shift time?

A string without an explicit offset may be interpreted in the browser's local time zone.

Are negative timestamps supported?

Yes. Negative integers represent instants before 1970-01-01T00:00:00Z.

What does Now generate?

It inserts the current Unix time in whole seconds and converts it immediately.

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