About this tool
Convert strict Unix timestamps and unambiguous date strings into UTC, ISO, and local representations without sending data anywhere.
How to use it
- Enter a Unix timestamp or supported date string.
- Review the detected input format and converted instant.
- Copy the representation required by your application.
Accepted formats
- Unix seconds: 1707350400; Unix milliseconds: 1707350400000.
- ISO 8601: 2024-02-08T00:00:00Z or an explicit offset; RFC 2822: Thu, 08 Feb 2024 00:00:00 GMT.
- Date-only input such as 2024-02-08 means midnight UTC.
Timezone behavior
- UTC and ISO outputs describe the same instant; Local time uses your device timezone.
- Ambiguous locale-style dates are rejected so results stay consistent across browsers.
Numeric rules
- Signed values up to 10 digits are seconds; 11–13 digits are milliseconds.
- Unsafe integers and values outside JavaScript’s Date range are rejected.