Bivonio

Unix timestamp converter

Convert Unix seconds or milliseconds to UTC dates and back.

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How to use this tool and limits

Unix measures time from 1970-01-01T00:00:00Z. Choose the direction and unit. Date input must include Z or an offset such as +02:00. Output dates always show UTC.

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Frequently asked questions

How do I avoid timezone ambiguity?

Specify the zone. 2026-10-12T14:00:00+02:00 equals 2026-10-12T12:00:00Z. A local time without a zone is rejected.