Tool Lockers
Developer utilities

Developer utility

Timestamp Converter

Convert Unix timestamps in seconds or milliseconds to dates, or convert a local date and time back to Unix time.

Practical guide

Using the Timestamp Converter

Convert Unix timestamps and date-time values.

Example

Input

Unix seconds: 1735689600

Expected result

2025-01-01T00:00:00.000Z

Supported inputs

  • Unix timestamps in seconds or milliseconds.
  • Local date and time values for conversion to Unix seconds and milliseconds.

Limitations

  • Unix timestamps represent instants in UTC; the displayed local time depends on your browser's time zone.
  • The date input does not include an explicit time-zone selector.

Frequently asked questions

How can I tell whether a timestamp is seconds or milliseconds?

The tool treats values below 100 billion in magnitude as seconds and larger values as milliseconds.

Why does local time differ from ISO time?

ISO output is UTC, while local time is formatted using your device's time zone.