Timestamp Converter

Convert Unix seconds or milliseconds to labeled dates, time zones, and relative time—or convert dates back live.

Workspace

Live conversion

Choose an input

Results update as the input or interpretation changes.

Same instant

Converted date and timestamp

Enter a timestamp or choose a date and time to see every format.

Guide

How to use

  1. Choose Timestamp to date or Date to timestamp.
  2. Enter a value. Timestamp units can be detected automatically or fixed to seconds or milliseconds; entered dates can be interpreted as browser-local time or UTC.
  3. Compare ISO 8601, UTC, local, selected-zone, Unix-second, Unix-millisecond, and relative-time results as they update.
  4. Copy individual values or all formats, reverse the conversion, or download the labeled results as CSV.
Help

Frequently asked questions

What is a Unix timestamp?

It counts elapsed seconds or milliseconds since 1 January 1970 at 00:00:00 UTC.

How does automatic timestamp-unit detection work?

Values with an absolute magnitude of at least 100 billion are treated as milliseconds; smaller values are treated as seconds. Select a unit manually for unusual historical or far-future values.

How is an entered date and time interpreted?

Choose Browser local time to apply your device's current time-zone rules, or UTC to treat the entered clock time as Coordinated Universal Time.

Do named-zone results account for daylight saving time?

Yes. London, New York, Los Angeles, Sydney, and the other named-zone displays use the browser's time-zone data for the converted instant.

Can it convert dates before 1970 or fractional seconds?

Yes. Negative timestamps represent dates before the Unix epoch, and decimal seconds preserve millisecond precision when the date range is supported.

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