Unix Timestamp Converter

Convert Unix seconds, milliseconds and timezone-qualified ISO dates with explicit units.

Private browser workspaceInput: Unix time / ISO date → Output: UTC / seconds / milliseconds

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Your file never leaves this browser

Processing happens locally using browser APIs and on-device code. Closing this tab clears the working data.

How it works

Done in three simple steps

Choose unix time / iso date from your device or use the available text controls.

Choose the available options and process the input locally.

Review the result, then download it to your device.

Good to know

How do I avoid seconds-versus-milliseconds mistakes?+

Select the input unit explicitly. Output includes both units and a UTC ISO date, making a unit mismatch easy to spot.

Are my files uploaded?+

No. Processing happens on this device. The tool may download its own code, but source files and output are not sent to a processing server.